Key takeaways
- Mass (ounces): determines how much line you can drag behind the bag and how well it holds a line in wind. Too light and the bag stalls at 35 ft with a tail of line hanging below it; too heavy and it punches through a tight union and lands on the far side.
- Shape: controls flight stability and, more importantly, what happens in the last two feet before the crotch. A teardrop wedges; a cylinder passes; a sphere rolls.
- Shell material: controls how long the bag survives bark abrasion, wet grass, gravel driveways, and being hauled back down through the canopy.
- Fill density: determines how compact a given weight can be. Two 12 oz bags can differ by 40% in volume depending on whether they are filled with lead or steel.
- Attachment: the sewn loop, ring, or swivel is the single most common failure point, and its geometry dictates which line diameters work cleanly.
The best arborist throw weight for most people is a 10–14 oz teardrop or bullet-shaped bag in a 1000D Cordura shell filled with lead or steel shot, matched to 1.75–2.2 mm throwline — that combination clears the 40–60 ft crotches found in typical backyard hardwoods without bouncing out of the union or dragging the line short. If you routinely throw above 60 ft, step up to a 14–16 oz bag; if you work low canopies, dense ornamentals, or thin-barked trees, a 6–8 oz bag will set more accurately and do less damage.
What actually decides accuracy: five variables, not one
Throw weight marketing tends to reduce everything to ounces, which is only about a third of the story. Accuracy at height comes from how five variables interact:
- Mass (ounces): determines how much line you can drag behind the bag and how well it holds a line in wind. Too light and the bag stalls at 35 ft with a tail of line hanging below it; too heavy and it punches through a tight union and lands on the far side.
- Shape: controls flight stability and, more importantly, what happens in the last two feet before the crotch. A teardrop wedges; a cylinder passes; a sphere rolls.
- Shell material: controls how long the bag survives bark abrasion, wet grass, gravel driveways, and being hauled back down through the canopy.
- Fill density: determines how compact a given weight can be. Two 12 oz bags can differ by 40% in volume depending on whether they are filled with lead or steel.
- Attachment: the sewn loop, ring, or swivel is the single most common failure point, and its geometry dictates which line diameters work cleanly.
A 12 oz bag that is oversized for its weight catches air, drifts in crosswinds, and arrives at the crotch slowly — which sounds harmless until you realize a slow arrival means a floppy arc and a poor set. A 12 oz bag that is dense and small flies flat, arrives fast, and seats. Same number on the label, very different tool.
Throw weight sizes at a glance: height, wind, and line matching
The table below reflects the general relationship between mass, realistic hand-throw height, and the throwline diameter that pairs cleanly with each weight. “Effective height” assumes a calm day, a clean underhand pendulum throw, and a thrower with a season or two of practice. Subtract 20–30% in a steady crosswind.
| Weight | Metric | Realistic hand-throw height (calm) | Useful in wind | Paired throwline diameter | Typical market range |
|---|---|---|---|---|---|
| 6 oz | 170 g | 25–35 ft | No | 1.5–1.8 mm | $12–$22 |
| 8 oz | 227 g | 30–45 ft | Light breeze only | 1.5–1.8 mm | $14–$25 |
| 10 oz | 284 g | 40–55 ft | Moderate | 1.75–2.0 mm | $15–$28 |
| 12 oz | 340 g | 45–60 ft | Good | 1.8–2.2 mm | $16–$30 |
| 14 oz | 397 g | 50–70 ft | Good | 2.0–2.2 mm | $18–$32 |
| 16 oz | 454 g | 55–75 ft | Very good | 2.0–2.5 mm | $20–$35 |
| 20 oz | 567 g | 60–80 ft | Excellent | 2.2–2.5 mm | $24–$40 |
Two things about that table matter more than the numbers. First, height scales with mass far more slowly than people expect: doubling from 8 oz to 16 oz buys you roughly 25–30 ft, not double. Second, the line diameter pairing is not optional. A 16 oz bag on 1.5 mm line will drag the line so hard through the attachment that the loop abrades from the inside, and a 6 oz bag on 2.5 mm line simply cannot pull enough line behind it to reach the height the weight alone would suggest.
Shape: how a bag behaves in the air and in the crotch
Shape is where the biggest accuracy differences hide, and it is the spec most buyers ignore.
| Shape | Flight behavior | Behavior at the crotch | Best for | Weakness |
|---|---|---|---|---|
| Teardrop | Stable, self-righting, forgiving of a sloppy release | Wedges into the union and holds | General hardwood work, isolated limbs | Can stick too well in rough bark and need a flick to free |
| Cylinder / bullet | Flattest, fastest flight; least drag | Passes through forks rather than seating | Long throws, Big Shot launching, dense canopies | Bounces out of shallow crotches; less forgiving of bad aim |
| Sphere / ball | Slightly unstable, tends to roll off target | Rolls, rarely snags, easy to retrieve | Smooth-barked trees, deadwood removal, retrieval-heavy work | Worst for setting a line in a specific union |
| Wedge / cone | Good penetration through foliage | Pushes through twiggy growth to reach the wood | Conifers, dense ornamentals, overgrown fruit trees | Poor long-range flight; short effective height |
| Flat / coin | Floats, drifts in any breeze | Rarely seats reliably | Very short throws under 25 ft | Wind-sensitive; not a serious working shape |
For most residential and small commercial work, teardrop is the correct default because the whole point of a throw is to seat a line in a specific union. Cylinders earn their place when you are launching rather than throwing, or when the canopy is so dense that a teardrop snags on the way up. Spheres are a niche tool — genuinely useful when you want the line back down without a fight.
Shell material: the construction trade-off table
The shell is what you actually pay for over the life of the bag. Fills are cheap; abrasion resistance is not.
| Shell material | Abrasion resistance | Wet-weather behavior | Wear pattern | Typical market range (per bag) |
|---|---|---|---|---|
| 1000D Cordura nylon | Excellent | Absorbs some water, dries fast, no swelling | Seams and corners fray first, typically after 300–600 throws | $18–$35 |
| 500–600D nylon | Moderate | Wets through faster; fill can shift | Fabric thins and pills around the equator | $10–$20 |
| Ballistic nylon | Excellent, smoother surface | Low absorbency | Attachment loop fails before the shell does | $22–$40 |
| Leather | Very good, but stiffens with age | Soaks water, gets heavy, needs drying | Cracks at the fold lines; stitching pulls | $20–$45 |
| Vinyl-coated polyester | Good against bark, poor against gravel | Fully waterproof, wipes clean | Coating scuffs and peels in patches | $8–$18 |
| Canvas | Moderate | Heavy when wet, slow to dry | Seam blowout and rot if stored damp | $8–$16 |
The practical takeaway: a 1000D Cordura or ballistic nylon shell with double-stitched seams and a bar-tacked attachment loop will outlast three cheap vinyl bags for the same money. Leather is the traditional choice and still excellent for grip and feel, but it is the wrong material if you work in wet conditions or leave gear in a truck bed.
Fill material: lead, steel, zinc, sand, and why density matters
Fill determines how small a bag can be for its weight. Small and dense flies flatter, arrives faster, and seats harder. Large and light catches air and drifts.
| Fill | Approximate density | Approximate volume of a 12 oz bag | Notes | Typical market range |
|---|---|---|---|---|
| Lead shot | 11.3 g/cm³ | ~30 cm³ (roughly 2.8 × 1.2 × 1.2 in) | Smallest profile per ounce; densest common option; check local rules on lead | $18–$35 |
| Steel shot | 7.8 g/cm³ | ~44 cm³ (roughly 3.2 × 1.3 × 1.3 in) | Larger for the same weight, but non-toxic and widely available | $15–$30 |
| Zinc shot | 7.1 g/cm³ | ~48 cm³ | Non-toxic alternative; slightly bulkier than steel | $18–$32 |
| Copper-plated steel | ~8.0 g/cm³ | ~43 cm³ | Flows well, resists clumping, premium pricing | $22–$40 |
| Sand | 1.6 g/cm³ | ~215 cm³ (a bag nearly 4× larger) | Cheap but bulky, holds moisture, shifts inside the shell | $6–$14 |
| BBs / airgun shot | ~7.5 g/cm³ | ~46 cm³ | Common in budget bags; rattles and settles over time | $8–$18 |
Where you throw matters here. In a tight union 55 ft up, a compact lead-filled 12 oz bag has a real advantage over a sand-filled 12 oz bag that is the size of a small fist: the compact bag threads the gap, the bulky bag clips the branch above it. The counter-argument is environmental — some land managers and employers restrict lead, and lead shot inside a torn shell leaves contamination on the ground. Steel and zinc have closed that gap considerably, and a modern steel-shot 12 oz bag is a reasonable first choice for most people.
Attachment hardware and throwline compatibility
The attachment is where the bag meets the line, and it is the part most likely to end your climb early. Four designs dominate:
- Sewn webbing loop: lightest, cheapest, most common. Works with any line you can tie a girth hitch or a small figure-eight in. Fails by fraying at the base of the loop.
- Metal ring or grommet: less friction, easier to swap lines with a quick clip, but the ring can abrade a thin Dyneema line if the ring’s finish wears.
- Swivel: reduces line twist on the way up, which matters most with stiff 2.2–2.5 mm lines. Adds weight and one more failure point.
- Quick-release clip: convenient for switching between lines; heavier and noisier than a loop.
Line pairing rules worth memorizing:
- 1.5–1.8 mm Dyneema throwlines (the Zing-It and Fling-It family) pair with 6–10 oz bags. Thinner line means less drag, so the weight can be lighter — but thin line cuts gloves and hands on a fast run.
- 1.8–2.2 mm throwlines pair with 10–14 oz bags. This is the mainstream working combination.
- 2.2–2.5 mm throwlines pair with 14–20 oz bags. The extra mass is needed to pull the heavier, stiffer line.
Knot choice matters too. A girth hitch through the loop is the standard; a small figure-eight or a scaffold knot adds security at the cost of a bulkier package that can catch on twigs on the way up. Whatever you tie, check it every time you re-rig — a knot that has been dragged through bark for an hour is not the knot you tied.
Decision matrix: pick by situation, not by brand
| Your situation | Weight | Shape | Shell | Why |
|---|---|---|---|---|
| Backyard fruit trees, under 30 ft | 6–8 oz | Teardrop | 600D nylon | Light mass does less damage to thin bark and small limbs; teardrop seats in narrow unions |
| Suburban hardwoods, 40–50 ft | 10 oz | Teardrop | 1000D Cordura | The default do-everything setup; enough mass for 50 ft, not enough to blow through a fork |
| Mature oaks and maples, 60–80 ft | 14–16 oz | Cylinder or teardrop | 1000D Cordura or ballistic nylon | Mass needed to carry line to height and hold in a breeze |
| Dense conifers and overgrown ornamentals | 10–12 oz | Wedge or cone | Ballistic nylon | Penetrates twiggy outer canopy; the shape matters more than the ounces here |
| Exposed ridge or coastal wind | 16 oz | Cylinder | Ballistic nylon | Mass tracks straighter; flat sides resist drift |
| Thin-barked species (beech, birch, young maples) | 6–8 oz | Teardrop | 600D nylon or leather | Lower impact energy reduces bruising; softer shell contacts bark more gently |
| Cold-weather work, gloves on | 12 oz | Teardrop | Vinyl-coated or leather | Heavier mass compensates for reduced feel and a stiffer throw; non-absorbent shell avoids a frozen bag |
| Big Shot launching | 10–12 oz | Cylinder | 1000D Cordura | Launcher does the work; a streamlined shape flies straight and reaches 80–100 ft |
| Beginner learning technique | 10 oz | Teardrop | 1000D Cordura | Forgiving in flight, easy to feel, cheap enough to lose |
| Production crew, multiple climbers | 10 oz and 14 oz, two colors | Teardrop and cylinder | 1000D Cordura | Two bags cover nearly every tree; color coding prevents mix-ups between climbers |
The throw weights, by weight, shape, and job
The sections below break the market down by the combinations you will actually find on a supplier’s shelf. Where a specific model exists, it is named; where the category is dominated by generic manufacturing, the bag is described by spec. Prices are general market ranges for a single bag, not for kits.
6 oz micro teardrop throw weight
A 6 oz (170 g) micro bag is the tool for small trees, low crotches, and thin-barked species where a heavier bag would either bruise the wood or be overkill. It is also the right choice for ornamental work — Japanese maples, crepe myrtles, dwarf fruit trees — where the unions are narrow and a 12 oz bag would sail straight through the target and land in the neighbor’s yard.
Specs to look for: 1.5–1.8 mm line pairing, a body roughly 1.75–2 in tall, and a shell that is thin enough to keep the bag small. Most 6 oz bags are 500–600D nylon because 1000D Cordura adds enough fabric weight that the bag approaches 7 oz before fill, which defeats the purpose. Expect to pay $12–$22.
Trade-offs: 6 oz stalls quickly in any breeze and its effective hand-throw height tops out around 35 ft. It also carries so little momentum that a slightly high throw will not pull the line over the limb — the bag lands on the branch instead of draping over it. If you find yourself short on 40 ft targets, move up to 8 oz rather than throwing harder, because over-throwing a light bag is the fastest way to build bad habits.
8 oz teardrop throw weight
Eight ounces is the lightest weight that still behaves like a working tool rather than a specialty item. It clears 30–45 ft comfortably, pairs with 1.5–1.8 mm line, and remains the best compromise for arborists who work a mix of residential ornamentals and mid-size hardwoods.
Specs: teardrop profile, roughly 2.25–2.5 in tall and 1–1.25 in at the widest point in a 1000D Cordura shell, with a bar-tacked webbing loop. Market range $14–$25. In lead fill, an 8 oz bag is remarkably compact — small enough to thread a fork that a 12 oz bag would clip.
Trade-offs: in a moderate crosswind above 35 ft, an 8 oz bag drifts noticeably, and on 2.2 mm line it struggles to pull enough slack to reach the target. If your throwline is thicker than 1.8 mm, this is not the bag for you. Its strength is precision at moderate height: for a 40 ft crotch in a smooth-barked tree, an 8 oz teardrop will set more accurately than anything heavier.
10 oz teardrop throw weight
Ten ounces is the single best all-round throw weight for residential and light commercial work, and if you only own one bag, this is the one. It reaches 40–55 ft on a clean throw, holds its line in a moderate breeze, and pairs with the 1.75–2.0 mm throwline most people already own.
Specs: 2.5–2.75 in tall, 1.1–1.3 in wide, 1000D Cordura or ballistic nylon shell, double-stitched seams, webbing loop with bar tacks. Lead fill keeps it compact; steel fill adds about 25% volume for the same weight. Market range $15–$28.
Trade-offs: none that matter at this height. The 10 oz bag’s only real limitation is above 55 ft, where you need either more mass or a Big Shot. It is also light enough to bounce out of very shallow, wide-angled unions — the kind you find on mature elms — where a 14 oz bag seats better because it arrives with more authority. That is a narrow complaint against a very capable default.
12 oz teardrop throw weight
Twelve ounces is the first weight that reliably carries line through a 60 ft throw without a launcher. It is the standard bag for mature suburban hardwoods — oaks, maples, sycamores, tulip poplars — where the target union sits somewhere between 45 and 60 ft and the canopy below it is thick enough to strip momentum from a lighter bag.
Specs: 2.75–3 in tall, 1.2–1.4 in wide, 1000D Cordura shell, 1.8–2.2 mm line pairing. In steel shot the bag runs noticeably larger than the lead version; if you work tight unions, choose lead or a high-density fill. Market range $16–$30.
Trade-offs: 12 oz arrives with enough energy to bounce out of shallow forks, and it is the point at which thin-barked trees start to show impact marks if you repeatedly hit the same limb. It also requires more deliberate technique — a 12 oz bag thrown with a muscled, off-plane release will arc sideways and take your line with it. The upside is real: on a windy day, 12 oz is where throws stop being a gamble.
14 oz teardrop throw weight
Fourteen ounces is the tall-tree hand-throw weight. It reaches 50–70 ft, holds a line in a stiff breeze, and has enough momentum to punch through a light outer canopy on the way to the target union. For arborists working mature hardwoods from the ground with no launcher, this is the workhorse.
Specs: 3–3.5 in tall, 1.3–1.5 in wide, 1000D Cordura or ballistic nylon, 2.0–2.2 mm line pairing, attachment loop or ring. Market range $18–$32. Lead fill is strongly preferable at this weight — a steel-filled 14 oz bag is bulky enough to catch air and lose the flight advantage the extra mass was supposed to buy.
Trade-offs: 14 oz does measurable bark damage on thin-barked species when thrown hard, and it bounces out of tight forks more often than a 10 oz bag. It is also heavy enough that a full day of throwing wears out a shoulder. If you are working 60 ft trees all day, consider a Big Shot and a 10–12 oz cylinder instead of hand-throwing 14 oz repeatedly.
16 oz teardrop throw weight
Sixteen ounces is the practical ceiling for hand-throwing. It reaches 55–75 ft, tracks straight in wind that would make a 10 oz bag useless, and pulls a heavy 2.2–2.5 mm throwline without stalling. For very tall hardwoods, exposed sites, or long-line rigging setups, it is the bag that gets the job done.
Specs: 3.25–3.75 in tall, 1.4–1.6 in wide, ballistic nylon or 1000D Cordura shell, 2.0–2.5 mm line pairing. Market range $20–$35. Double-stitched seams and a reinforced attachment are non-negotiable at this weight — a 16 oz bag generates enough force on impact to blow out a single-stitched seam in a few dozen throws.
Trade-offs: fatigue, bark damage, and bounce-out are all worst at 16 oz. It is a specialist tool, not a daily driver. Many experienced climbers carry a 16 oz bag specifically for the first throw on a tall tree and switch to a 10 oz bag once the line is set for subsequent redirects. Also note that a 16 oz bag dropped from height is genuinely dangerous — keep your hard hat on and your face out of the drop zone.
8 oz cylinder throw weight
The cylinder — often called a bullet — is the most aerodynamic shape available, and at 8 oz it is the lightest long-throw option. It flies flat, arrives fast, and passes through forks instead of seating in them. That makes it ideal for line-setting where you intend to isolate a limb by pulling the line back and forth rather than wedging the bag in a union.
Specs: roughly 2.5–3 in long, 0.9–1.1 in diameter, 1000D Cordura, 1.5–1.8 mm line pairing. Market range $14–$25. The narrow profile is the point: a cylinder will slip through a fork that a teardrop of the same weight cannot enter.
Trade-offs: cylinders are less forgiving of a poor release and they bounce out of shallow crotches more readily. They are also harder to see in a canopy because they present a smaller silhouette. Pair one with high-visibility line if you work alone.
10 oz cylinder throw weight
A 10 oz cylinder is the classic Big Shot projectile. Launched from a pole-mounted rubber-band launcher, it reaches 80–100 ft and flies straight enough to hit a target the width of a dinner plate. It is also the best hand-throw option for dense canopies where a teardrop would snag on the way up.
Specs: 2.75–3.25 in long, 1.0–1.2 in diameter, 1000D Cordura, 1.75–2.0 mm line pairing. Market range $15–$28. A smooth surface finish matters here — a cylinder with exposed stitching catches on twigs and slows dramatically in the last 10 ft of flight.
Trade-offs: like all cylinders, it does not wedge, so if your technique is to throw into a union and let the bag seat, you will be disappointed. It is also the shape most likely to overshoot a small tree entirely.
12 oz cylinder throw weight
Twelve ounces in a cylinder is the standard launcher payload for tall trees, and a strong hand-throw choice for 50–60 ft targets in cluttered canopies. It combines the flight characteristics of a bullet with enough mass to pull 2.0 mm line without stalling.
Specs: 3–3.5 in long, 1.1–1.3 in diameter, 1000D Cordura or ballistic nylon, 1.8–2.2 mm line pairing. Market range $16–$30. In a launcher, this weight pairs with medium rubber bands; heavier bags require stiffer bands and a stronger pole.
Trade-offs: 12 oz cylinders hit hard. A mis-throw that lands on a roof, a car, or a person is a genuine problem — launcher work demands a clear drop zone and a spotter. Hand-throwing, the shape is less accurate than a teardrop at the same weight because it will not seat itself.
14 oz cylinder throw weight
Fourteen ounces in a cylinder is the heavy launcher payload for the tallest residential trees, and a hand-throw option for exposed, windy sites where a teardrop would drift off line. It flies like a dart and holds its trajectory in conditions that defeat lighter bags.
Specs: 3.25–3.75 in long, 1.2–1.4 in diameter, ballistic nylon or 1000D Cordura, 2.0–2.2 mm line pairing. Market range $18–$32. Check that your launcher’s bands and pouch are rated for this mass — a 14 oz projectile leaving a worn pouch can go badly off-line.
Trade-offs: at this weight the cylinder is genuinely dangerous on a miss, and it requires a longer, more deliberate retrieval because it tends to bury itself in leaf litter. It is also the shape least likely to hold a line in a shallow union, so expect to isolate by pulling the line rather than by wedging the bag.
16 oz cylinder throw weight
Sixteen ounces in a cylinder is a specialist tool for very tall trees, heavy line, and windy conditions. It is almost always used with a launcher rather than thrown by hand, and it is the shape and weight that pulls 2.2–2.5 mm line to 80 ft and beyond without stalling short of the target.
Specs: 3.5–4 in long, 1.3–1.5 in diameter, ballistic nylon, 2.0–2.5 mm line pairing, reinforced attachment. Market range $20–$35. Double-stitched seams, bar-tacked loop, and a smooth exterior are all essential at this weight.
Trade-offs: everything about 16 oz cylinders is unforgiving — launch energy, impact damage, retrieval effort, and the consequences of a miss. Reserve it for trees that genuinely need it, and always wear a helmet with a chin strap.
10 oz high-density compact throw weight
This is a category rather than a specific model: a 10 oz bag built as small as the fill allows, usually with lead or a lead-alternative high-density shot, in a shell that adds minimal bulk. The result is a bag roughly the size of a large walnut that flies flat and threads narrow forks.
Specs: 2–2.5 in tall, under 1.1 in wide, 1000D Cordura or ballistic nylon, 1.75–2.0 mm line pairing. Market range $18–$30. The tell is the ratio of weight to size: if a “10 oz” bag looks like a 12 oz bag, the fill is not dense.
Trade-offs: compact bags are harder to see and easier to lose, and the smaller surface area means the attachment loop occupies a larger proportion of the bag — which is where failures concentrate. They are also less stable in a strong crosswind than a larger bag of the same weight, because a bigger silhouette actually helps a bag track straight when it has mass behind it.
12 oz steel-shot long-throw bag
A 12 oz steel-shot bag is the mainstream non-lead option. Steel’s lower density means the bag is roughly 25–30% larger in volume than a lead-filled equivalent, which costs some flight efficiency but delivers a non-toxic, widely permitted tool that works in almost every situation a lead bag does.
Specs: 3–3.25 in tall, 1.3–1.5 in wide, 1000D Cordura shell, 1.8–2.2 mm line pairing. Market range $15–$30. Steel shot tends to settle and rattle over time; a well-made bag uses an internal liner or baffle to limit shifting.
Trade-offs: the larger profile catches more air, so expect 5–10% less height than a lead bag of the same weight. Steel also makes a sharper sound on impact, which matters if you are working near clients or in a quiet residential neighborhood at dawn. In exchange you get a bag that meets most employer and land-manager policies without argument.
14 oz spherical throw weight
A 14 oz sphere is a retrieval specialist. It rolls off limbs, refuses to snag, and comes back down the way it went up, which makes it genuinely useful for deadwood work, for smooth-barked species where teardrops wedge annoyingly well, and for any tree where you expect to make several throws.
Specs: 1.5–1.75 in diameter, 1000D Cordura or vinyl-coated shell, 2.0–2.2 mm line pairing. Market range $18–$32. A sphere’s attachment loop sits at a single point on the surface, so look for a reinforced patch rather than a bare stitched tab.
Trade-offs: spheres do not seat. If your goal is to wedge a bag in a specific union so the line stays put while you set your climbing line, a sphere is the wrong tool. They are also the least aerodynamic common shape and drift more in wind than their mass suggests.
16 oz wedge or cone throw weight
A wedge or cone profile is designed to push through twiggy outer canopy to reach structural wood. At 16 oz it has enough mass to carry line through a dense conifer crown, which is a job that defeats almost every other shape at the same weight.
Specs: 3–3.5 in long, tapering to a blunt point, 1.2–1.5 in at the base, ballistic nylon, 2.0–2.5 mm line pairing. Market range $20–$35. Smooth, seamless construction matters more here than anywhere else — the whole point is to slip through obstructions rather than grab them.
Trade-offs: wedges are short-range tools. Their drag profile costs height, so a 16 oz wedge may reach only 45–55 ft while a 16 oz cylinder reaches 75. They are also the shape most likely to become genuinely stuck, because penetrating foliage and then wedging in a tight fork is exactly what the geometry encourages.
20 oz heavy-duty launcher weight
A 20 oz bag exists for one job: reaching the first union on very tall trees, usually with a launcher, where nothing lighter will pull the line to height against wind or canopy drag. It is not a hand-throw weight for most people.
Specs: 3.5–4.25 in long in cylinder form or 3.75–4.25 in tall in teardrop form, ballistic nylon shell, 2.2–2.5 mm line pairing, reinforced attachment and double-stitched seams throughout. Market range $24–$40.
Trade-offs: at 20 oz, every downside of heavy bags is amplified — impact damage, retrieval difficulty, fatigue, and the risk of a dropped bag. It also requires a launcher rated for the mass; using one in a light-duty pole risks a broken pouch or a bent frame. Most climbers who own a 20 oz bag use it fewer than a dozen times a year.
8 oz leather-shell traditional throw weight
Leather-shell bags — the style long associated with makers such as Weaver and Buckingham — are still made and still have a following. Leather grips bark, feels substantial in the hand, and develops a worn-in suppleness that fabric bags never match.
Specs: 2.25–2.5 in tall, 1.1–1.25 in wide, stitched leather shell over shot fill, 1.5–1.8 mm line pairing. Market range $20–$45, with the upper end reflecting hand-stitched construction.
Trade-offs: leather absorbs water, gains weight, and must be dried thoroughly or it cracks at the fold lines and eventually rots the stitching. It is also heavier for a given nominal weight once wet, which throws off your calibrated sense of how hard to throw. In dry climates and short sessions, leather remains a pleasure to use; in wet ones, it is a liability.
12 oz reflective or high-visibility throw weight
Visibility is an underrated spec. A 12 oz bag in bright orange or chartreuse with a reflective strip is dramatically easier to find in leaf litter, on a roof, or in a hedge at dusk — and easier to track in flight, which helps you diagnose why a throw missed.
Specs: standard 12 oz teardrop dimensions (2.75–3 in tall, 1.2–1.4 in wide), 1000D Cordura in high-visibility color, reflective piping, 1.8–2.2 mm line pairing. Market range $18–$32, a small premium over the same bag in a muted color.
Trade-offs: reflective material and bright coatings can stiffen the shell slightly, and high-visibility fabric shows dirt quickly. Neither affects performance. For anyone working alone, near roads, or in fading light, the visibility premium is worth paying.
Building a two-weight kit (and a three-weight kit for production work)
Most arborists do not need one perfect bag; they need two bags that cover the range. A practical two-bag kit:
- Bag one: 10 oz teardrop, 1000D Cordura, lead or steel fill, high-visibility color. This handles 80% of residential work.
- Bag two: 14 oz cylinder, ballistic nylon, 2.0–2.2 mm line pairing. This covers tall trees, wind, and launcher work.
Two bags in contrasting colors prevent the classic mix-up where you grab the wrong weight for the tree in front of you. Add a third bag if you do production work: a 6–8 oz teardrop for ornamentals and thin-barked species, kept in a different color again. Three bags, three colors, three weight classes covers essentially every tree a ground-based arborist will encounter.
Carry spare attachment hardware — a couple of quick clips or a spare ring — and a length of cord to re-rig if a loop fails at height. A throw weight that separates from the line 50 ft up means a lost line, not just a lost bag.
What wears out first, and the inspection schedule that catches it
Throw weights do not fail gracefully. They fail at the attachment or the seam, usually mid-throw, usually at height.
| Component | Inspect every | Failure sign | Action | Replacement cost range |
|---|---|---|---|---|
| Attachment loop or ring | Every use | Fraying fibers, a soft or thinning base, a ring that spins freely where it used to be tight | Retire the bag or re-rig with a backup clip | Bag replacement $15–$35 |
| Seams | Every 5–10 uses | Visible stitch gaps, fabric puckering, fill leaking at a corner | Retire; do not field-repair a shot-filled bag | $15–$35 |
| Shell fabric | Every 5–10 uses | Thinning at the equator, pilling, small holes where bark has abraded through | Retire when you can see fill through the fabric | $15–$35 |
| Fill integrity | Monthly | Rattling that changes pitch, a bag that feels lighter than its label | Weigh it; a bag that has lost fill flies unpredictably | $15–$35 |
| Throwline | Every use | Fuzziness, flat spots, glazing, a diameter that has grown from picked fibers | Cut back the damaged section or replace the line | $25–$60 for a 150–200 ft hank |
A 1000D Cordura bag used several times a week typically lasts 300–600 throws before the attachment loop or a seam fails. Bags used on gravel, concrete, or rocky ground die faster — abrasion against stone is far more destructive than abrasion against bark. A cheap 500D nylon bag may fail in under 150 throws under the same conditions.
Storage matters as much as inspection. Store bags dry, loosely coiled, away from direct sun, and out of a sealed plastic bin where condensation collects. Ultraviolet light degrades nylon over a few seasons, and a bag left on a truck dashboard for a summer will lose a meaningful fraction of its seam strength.
Technique notes that change which weight you should carry
Weight choice and throwing technique are not independent. Three adjustments change the calculation:
- Underhand pendulum throw: the standard for accuracy. The bag swings from hip level and releases at roughly 45 degrees. This technique favors a teardrop and rewards a slightly heavier bag, because the pendulum’s momentum is what carries the line. If you throw this way, 10–14 oz is your range.
- Sidearm or overhand throw: more power, less accuracy. This technique suits cylinders and heavier bags, because the flat trajectory and higher release speed need a shape that will not tumble. If you throw this way, 12–16 oz cylinders are the natural pairing.
- Launcher: removes technique from the equation. Choose a cylinder in the 10–14 oz range and let the bands do the work. Weight selection becomes about line drag, not arm strength.
One more practical note: always throw with the line flaked loosely, never coiled. A coiled line creates drag that a lighter bag cannot overcome, which is the single most common reason a 10 oz bag “will not reach” a 45 ft crotch. Check the flake before you blame the weight.
Storage, visibility, and transport at home
A small gear bag with a mesh bottom lets wet throwline and wet bags dry without mildewing. Keep bags in individual pouches so shot-filled fabric does not abrade against itself in transit, and store throwline on a line winder rather than in a loose hank — a tangled 200 ft line costs more time than any weight choice ever will.
At home, a bench drawer or a wall hook near the garage door keeps throw weights where you can grab them, and a small parts bin for spare clips, rings, and a spare bag means a failure at the tree does not end the day. Label bags with their weight in permanent marker; the difference between 10 and 14 oz is easy to lose once the color fades.
Budget tiers: what you get at each price band
| Tier | Per bag | What you get | Expected service life |
|---|---|---|---|
| Budget | $8–$16 | 500–600D nylon or vinyl shell, sand or BB fill, single-stitched seams, basic webbing loop | 100–200 throws before seam or loop failure |
| Mid-range | $16–$28 | 1000D Cordura shell, steel or lead shot, double-stitched seams, bar-tacked loop | 300–600 throws with inspection |
| Premium | $28–$45 | Ballistic nylon or leather shell, high-density fill, reinforced attachment, high-visibility options | 500–800+ throws; shell often outlasts the attachment |
The mid-range band is where the value sits. The jump from budget to mid-range roughly triples service life for a modest increase in price; the jump from mid-range to premium buys durability and visibility rather than a dramatic performance gain.
Frequently asked questions
What weight is best for a 60 ft crotch?
Twelve to fourteen ounces, in a teardrop or cylinder, on 1.8–2.2 mm throwline. Ten ounces can reach 60 ft on a perfect throw in still air, but it will not do so reliably. If the tree is exposed to wind, go to 16 oz or use a launcher with a 12 oz cylinder.
Is lead shot or steel shot better?
Lead is denser, so a lead-filled bag is roughly 25–30% smaller for the same weight — a real advantage in tight unions and for flight efficiency. Steel is non-toxic, permitted under most employer and land-manager policies, and performs well enough that most people should default to it. Check local rules before buying lead.
Can I use a throw weight with a Big Shot launcher?
Yes, and 10–14 oz cylinders are the standard payload. Match the weight to your launcher’s band strength and pouch rating; a bag that is too heavy for the bands will launch short and off-line, and a bag that is too light will fly erratically.
Will a heavy throw weight damage the tree?
Repeated hard impacts from a 14–16 oz bag can bruise thin-barked species such as beech, birch, and young maples. For those trees, use a 6–8 oz teardrop and accept a lower maximum height. On thick-barked species like mature oaks, a 14 oz bag is not a concern.
Why does my throw weight keep bouncing out of the crotch?
Three causes, in order of likelihood: the bag is too heavy and arrives with too much energy, the shape is a cylinder or sphere that cannot wedge, or you are throwing past the target rather than into it. Try a teardrop one size lighter and aim at the union rather than above it.
