A hydration reservoir and a roll-top stuff sack, both written as operating instructions
What both listings have in common
Neither of these pages reads like a specification sheet. They read like a set of instructions, and the useful figures are the procedural ones. The dry bag states that the top is rolled at least three times before the buckle closes — no other listing on that shelf publishes a roll count, and the roll count is what makes the seal. The reservoir states that it can be turned inside out for cleaning, which is the difference between a bladder that survives a season and one that grows something.
The limit is written down
The dry bag publishes a 10,000 mm water column and then states explicitly what it is not for: submersion. That is a maker declining to let the word waterproof cover a canoe capsize, and it is the more honest of the two possible ways to write that page. On the reservoir, the equivalent line is a stated heat ceiling of 40 °C — a low bar for a black pack left on a rock in the sun, and one you would rather know about in advance than discover.
The reservoir is the better-documented of the two
It publishes an empty weight of 130 g, a full set of outside dimensions at 330 by 170 by 50 mm, a 3.0 litre capacity, a slide-clip closure stated to be both easy to fill and leak-proof, and a soft bite valve stated to close by itself so there is no lock to remember. On a shelf where most listings publish a capacity and stop, that is close to a complete answer.
What is left out of both
The materials. The reservoir names no film and no seam construction, which is odd on a page otherwise this thorough, and gives no hose length or internal diameter. The dry bag names no fabric at all, so a 10,000 mm figure sits on a cloth you cannot identify, with no denier, no coating, no seam treatment and no weight beside it; its volume appears only inside the model name, never restated with a unit in the bullets. Both are strong on how to use the thing and quiet on what it is made of.
3.0 L reservoir · slide-clip closure · reversible for cleaning · bite valve, auto-closing · 130 g
The only reservoir on this shelf to publish an empty weight — 130 g — alongside a slide-clip closure, full outside dimensions and a bladder the maker states can be turned inside out to clean.
Best for: A pack where the reservoir has to be cleaned and dried properly, and where 130 g is a figure you want to know rather than guess.
The only bag on this shelf to publish both the number of rolls its closure needs and the situation it is not built for, and the only one that names a limit at all.
Stated volume
15, from the model name Light Drypack 15 — the listing carries the figure in the name and does not restate it with a unit in the bullets
Fabric
Not published on the listing — the material is described only by what it withstands, not by what it is
Denier
Not published on the listing
Coating
Not published on the listing
Seam construction
Not published on the listing
Closure type
Roll closure with a buckle, rolled at least three times before the buckle is closed so the contents stay dry — stated, and the only roll count published on this shelf
Stated water rating
10,000 mm water column — stated, described as protecting against dust and heavy rain, with an explicit caution that the pack is not suitable for situations where it is submerged
Weight
Not published on the listing
Purge valve
Not published on the listing
Amazon reference
B0BP7JLZSC (same reference on 6 Amazon marketplaces)
EAN
4046051151786
Publishes the number of rolls the seal needs, which no other listing here does
States what it is not for — submersion — rather than leaving waterproof to cover everything
The fabric is never named, so a 10,000 mm figure sits on a cloth you cannot identify
Best for: Heavy rain and a dusty boot, with the honesty to say it is not a canoe bag.
