How do I match Tool Bag volume to a tool count?

Count pieces, measure the longest, weigh the set, then map 18 to 24 pieces to 28 to 32 litres and 30-plus to 40. Confirm the opening clears the longest diagonal.

Does higher fabric weight mean better abrasion resistance?

No. Abrasion depends on weave and base layer, not weight alone. A cloth marked 600 g/m² that measures 520 wears faster than a lighter cloth with a reinforced base.

Can a bag rated 25 kg be loaded to 25 kg?

That is a static pull under test conditions. Real use applies two discounts: bounce multiplies peak force and root stitching fatigues. Keep daily loads near 15 kg.

Is opening width the same as body length?

No. A 45 cm body gives about 41 cm of flat floor after binding, and the opening is narrower. Check the longest item against the opening.

What if one bag must serve workshop and road?

Take the larger load list, then compromise on carry mode: a detachable strap with a reinforced base covers hand and shoulder carry.

How to Choose a Tool Bag: Five Criteria

Quick answer: Score a Tool Bag on five criteria in order: load list, fabric weight, handle path, opening, carry mode. The first sets the baseline; the rest are measured against it. Eliminate failures first.

Five Criteria and Weights
Load List: Pieces and the Longest Item
Fabric Weight and Abrasion Layers
Load Rating and the Handle Path
Opening, Access and Carry Mode
FAQ

1. Five Criteria and Weights

Selection debates stall because too many dimensions share one table: looks, price, brand, volume, feel. Compress them into five measurable criteria. The load list is the only precondition; the rest are calibrated against it.

Criterion	Weight	Measure	Eliminating signal
Load list	25	count, longest, weight	cannot pass opening
Fabric weight	20	g/m², base layer	below label
Load rating	25	static rating, stitching	single stitch at root
Opening	20	width, lid angle	narrower than longest
Carry mode	10	hand, shoulder, trolley	one-handed lift fails

Eighty points or more is a decision. Between 60 and 80, re-read the eliminating signals; below 60 the brief is wrong.

2. Load List: Pieces and the Longest Item

A Tool Bag load list answers three questions: how many pieces, how long the longest, how heavy the set. All three come from tools on a bench.

Tool Bag: a red case standing on its side, handle up, metal eyelet at the top corner, plain front face, black backdrop

Count in three groups: long pieces above 300 mm, middle pieces such as sockets and pliers, small pieces such as bits. Eighteen to 24 pieces fit 28 to 32 litres, twelve or fewer fit 18 to 22, and past 30 pieces need 40 litres and about 14 kg.

The longest item governs opening and body length. A 45 cm label leaves about 41 cm of flat floor, so a 300 mm wrench enters diagonally but jams when laid flat.

3. Fabric Weight and Abrasion Layers

Fabric weight compares without a sample: heavy woven cloth sits near 600 g/m², high-tenacity weaves at 1000D and 1680D. Thicker is not automatically more abrasion resistant; the base and corner layers of a Tool Bag do that work.

Weigh instead of trusting the label. A cloth marked 600 g/m² that measures 520 is under-woven or damp; a gap beyond 8 percent is a reason to ask elsewhere. A base layer under 0.4 mm shows through after two drags on concrete.

Weight meets capacity at the stitch holes: tightening pitch from 5 mm to 4 mm raises seam strength more than heavier cloth does.

4. Load Rating and the Handle Path

The rating is not overall strength; it is the path force takes into the body. A Tool Bag rated 25 kg bulges at the base and fails at the handle root first.

Tool Bag: orange warehouse racking holding red hard cases two high on timber pallets, concrete floor, strip lights, blue benches behind

Webbing that passes through the body and is bar-tacked back beats webbing sewn outside. Two rows on 38 mm webbing suits loads near 15 kg; a separate base panel stops the floor sagging.

Thread matters too: polyester survives sun and damp, cotton does not. Clear all three points or plan on 60 percent. Walking bounce pushes peak force to one and a half times static, so 15 kg is comfortable and 20 kg becomes a carry-mode question.

5. Opening, Access and Carry Mode

The opening decides how often the user bends over. A U-shaped mouth folds the top back; a single zip limits width. Opening width must exceed the longest diagonal.

Pockets that reach the base stop small parts piling up, and removable panels let one Tool Bag cover a 20-piece and a 30-piece week. Carry mode comes last.

Carry mode	Full weight	Features needed	Mismatch shows as
Hand	under 8 kg	one-piece handle, 38 mm webbing	numb fingers after 200 m
Shoulder	under 12 kg	detachable strap, padded back	deep crease, body tilt
Trolley	under 30 kg	flat base, side mounts	sliding on the deck

Fix the weight first, choose carry mode, then check handle and mounts. Reversed, you get an excellent handle nobody can lift.

Conclusion

Five criteria move the argument from feel to measurement: the list sets the baseline, fabric weight the wear floor, handle and stitching the ceiling, the opening the access speed. What decides whether a Tool Bag survives three years is its weakest point.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.