Maker’s warranty: Limited lifetime warranty against defects in materials or workmanship; covers original owner, bought from Sea to Summit or an authorized reseller; paid repairs; spare parts sold. Sea to Summit’s terms, read Oct 25, 2026
A dry bag of 420D nylon with backpack straps from Sea to Summit, for kayaking, canoeing, rafting and motorcycle touring. It has a roll-top closure with replaceable Field Repair Buckles, fully taped seams, a white interior and an oval base. Sea to Summit lists a packed weight of 675 g.
Figures with a source link to the page they were read from, with the date we checked it.How we get these figures →Wrong figure? Tell us
Packs are sized by torso length, not height. How to measure yours →
Against every one of the backpacks in the RidgeNote register with a published figure. Manufacturer-listed; sources and dates are on this page.
Main models on the same shelf, compared with the Big River Dry Backpack on the makers’ published figures; the tick on each bar is the Big River Dry Backpack.
Gossamer Gear
Vetta 20L Daypack
9.3 oz lighter (264 g)
about the same list price
Gossamer Gear
Loris 25 Daypack
4.3 oz lighter (122 g)
$4.95 less
SealLine
Skylake Dry Daypack
10.4 oz lighter (295 g)
$10 more
Not ranked: 2 with no published weight.
See all 32 →
Gossamer Gear
Vagabond Jet
$9.95 less
0.7 oz heavier (19 g)
Gossamer Gear
Loris 25 Daypack
$4.95 less
4.3 oz lighter (122 g)
Gossamer Gear
Cima 15 Daypack
$20 less
6.0 oz lighter (170 g)
Not ranked: 34 with no published list price.
See all 5 →Ultralight backpacks ranked by maker-published weight: 40 models. Lightest: Gossamer Gear Murmur 36 Hyperlight Backpack (Aluula) at 7.9 oz (225 g).
Six backpacking packs from 45 to 68 L: how to fit one, then their published volume, frame, load range, weight and list price, with a reason to skip each.