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One good sentence

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Why it is right And a leak in a pack is not a mess Which is why weight is not the first requirement The five leaves it describes The two it does not And this catalog has no fuel bottle The window is 15 to 120 mL Eight containers at 15 mL or under The archetype names four dispensing types So read it as a plain-cap shelf References

"Leakproof under pressure change is the whole requirement." That is the best line in the taxonomy.

Why it is right

A decant goes in a pack, over a pass, in a plane's hold, in a dry bag, in a pocket. Pressure and temperature change repeatedly and the closure is the only thing holding the contents in.

And a leak in a pack is not a mess

It is soap in your food, fuel on your sleeping bag, or supplement powder through everything. The cost of the failure is out of proportion to the cost of the contents.

Which is why weight is not the first requirement

Everybody thinks it is. A hiker will carry an extra five grams of closure forever to avoid one leak, and that trade is already made before the bottle is chosen.

The five leaves it describes

Water treatment, soap decant, condiment decant, camp spice kit and trail supplement. Small, aqueous or dry, cold, poured or shaken, and carried.

The two it does not

Fuel decant and fire starter. Neither is aqueous, neither is cold, and both carry the flammability classifications the shop consumables property sets out.

And this catalog has no fuel bottle

A fuel bottle is a pressure-rated object made for the purpose. Nothing on this shelf is one, and that is said here at the start rather than left to be inferred.

The window is 15 to 120 mL

Which is the right window for the craft. 189 of the 453 containers on this shelf are 120 mL or under, and the median is 177, so the shelf is larger than its own archetype.

Eight containers at 15 mL or under

For a craft where a spice kit is six 10 mL containers, eight is the honest count at the bottom end.

The archetype names four dispensing types

Flip top, disc top, lotion pump and fine mist. The shelf has 19 flip tops and none of the other three.

So read it as a plain-cap shelf

369 of 526 closures are continuous thread. That is a real answer for a decant, because a plain cap with a good liner outperforms a dispensing closure under pressure, and it is not what the archetype asked for.

References

The archetype behind this shelf is store-liquid-decant: 15 to 120 mL, narrow mouth, flip top or disc top or lotion pump or fine mist, PET and HDPE, cold fill, thin, aqueous, poured, with "travel decant, leakproof under pressure change is the whole requirement" as its stated reason. All seven leaves sit on it, including fuel decant and fire starter, which are neither aqueous nor cold.

The Davis Pack Supply catalog, measured 18 October 2026. The camping and backpacking shelf is 979 rows: 453 containers and 526 closures. 15 mL to 500 mL with a median of 177; 8 containers at 15 mL or under, 27 at 30 or under, 86 at 60 or under, 189 at 120 or under, 394 at a pint or under. 201 PET, 126 HDPE, 76 PP, 50 glass. 221 bottles, 218 jars, 12 tubs and pails, 1 jug, 1 tube. 134 white, 114 clear, 66 natural, 52 amber. Closures: 369 continuous thread, 26 dome lids, 26 spouted, 19 flip top, 19 lug and twist, 18 child resistant, 11 liners and sealing discs, 9 phenolic, 7 spice caps, 7 buttress, 6 round tubs, and no disc tops, lotion pumps or fine mist sprayers.

Written from 40 CFR 152.500 and from the catalog as it stood on 18 October 2026. No log-reduction performance figures appear anywhere in this property, because the commonly cited numbers come from an EPA guide standard rather than a codified rule. Forest and park food storage orders are issued locally and are not summarized. Nothing here is a fuel bottle or a bear-resistant container.