Researched comparisonLast updated October 2026 · How we review
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Quick Answer
The Sea to Summit Big River 20L is our pick for most paddling and camping trips: it is the lightest bag here at 8.8 ounces, uses 420D nylon with a TPU laminate and carries a limited lifetime warranty. The SealLine Discovery 20L has the lowest price and the only bag here its brand calls fit for quick submersions. The ORTLIEB PD350 22L has the most room at 22 liters, IP64 protection and a 5 year warranty.
- Sea to Summit Big River Dry Bag 20L: best for paddlers who want the lightest bag here, 8.8 oz, in 420D nylon
- SealLine Discovery Dry Bag 20L: best for boaters who want a bag made for quick submersions with fully welded seams
- ORTLIEB Dry-Bag PD350 22L K4551: best for campers who want the most room here, 22 liters, with IP64 protection
Prices as of October 19, 2026, 7:18 am CT.
A dry bag keeps a sleeping bag, spare clothes or a phone dry in a canoe, on a paddleboard or in a rainstorm at camp. We compared three roll-top dry bags from Sea to Summit, SealLine and ORTLIEB in the 20 to 22 liter size, which fits a sleeping bag or a day’s worth of gear.
How We Chose
We picked three well-known outdoor gear brands and matched the size and type: each is a heavy-duty roll-top dry bag of 20 or 22 liters. They are close but not identical: the ORTLIEB holds 2 liters more, the fabrics differ (nylon, polyester and PVC-coated polyester), and each brand describes water protection in its own terms. None is sold as a fully submersible bag; SealLine lists the Discovery for quick submersions. Specs come from each manufacturer’s own product pages and datasheets, and each card lists the warranty from the brand’s own pages. Prices are the Amazon prices on the date shown.
The Lineup
Specs come from each manufacturer’s own pages and datasheets. Prices as of October 19, 2026, 7:18 am CT. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product. Amazon may show a different seller than the brand or Amazon.com. Certain content that appears on this site comes from Amazon. This content is provided “as is” and is subject to change or removal at any time.
Sea to Summit Big River Dry Bag 20L
$54.95 as of Oct 19, 2026, 7:18 am CT on Amazon · Lightest, lifetime warranty
Best for: paddlers who want the lightest bag here, 8.8 oz, in 420D nylon
Sea to Summit’s page for the Big River Dry Bag lists the 20 liter size at 8.8 ounces, made of 420D nylon with a waterproof TPU laminate, a triple-coated base, a 10,000 mm hydrostatic head and tape-sealed seams. It closes with a non-wicking roll-top and Field Repair Buckles and has lash points and double D-rings, and Sea to Summit’s FAQ says to avoid submersion. We like it for canoe trips, because the tough nylon handles being dragged across rocks and gravel.
Warranty: Limited lifetime
Check Price on Amazon →SealLine Discovery Dry Bag 20L
$44.95 as of Oct 19, 2026, 7:18 am CT on Amazon · Lowest price, quick submersions
Best for: boaters who want a bag made for quick submersions with fully welded seams
SealLine’s page for the Discovery Dry Bag lists the 20 liter size at 13.8 ounces and 6 by 10 by 21 inches, made of PVC-free 300D polyurethane-coated polyester with fully welded seams, an oval bottom and a DrySeal roll-top closure. SealLine calls it Waterproof, which it defines as withstanding quick submersions with at least three tight rolls. We like it for kayaking, because welded seams and quick-submersion protection suit a bag that may go overboard.
Warranty: Limited lifetime
Check Price on Amazon →ORTLIEB Dry-Bag PD350 22L K4551
$79.87 as of Oct 19, 2026, 7:18 am CT on Amazon · Most volume, 5 year warranty
Best for: campers who want the most room here, 22 liters, with IP64 protection
ORTLIEB’s datasheet for the Dry-Bag PD350 lists the 22 liter size at 10.2 ounces, 20.5 inches tall when rolled and 8.7 inches across, made of PVC-coated polyester with a reinforced PD620 bottom and 3D welded seams. It closes with a roll closure and side-release buckles, has two D-rings and a bottom loop, and carries an IP64 classification, with ORTLIEB noting water can enter through the closure if fully submerged. We like it for bike touring and canoe camping, because the round shape packs neatly into a hull or onto a rack.
Warranty: 5 years
Check Price on Amazon →Our Take
Pick the Sea to Summit Big River 20L for the lightest bag and a limited lifetime warranty. Pick the SealLine Discovery 20L for the lowest price and the only bag here listed for quick submersions. Pick the ORTLIEB PD350 22L if you want the most volume, IP64 protection and a 5 year warranty.
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Frequently Asked Questions
Are dry bags fully waterproof underwater?
Not these. Sea to Summit says to avoid submersion with the Big River, ORTLIEB says water can enter through the closure of the PD350 if it is fully submerged, and SealLine lists the Discovery for quick submersions only.
How many times should I roll a dry bag?
SealLine says to use at least three tight rolls, and ORTLIEB measures the PD350 height with the top rolled three to four times. Rolling at least three times is a good rule for any roll-top bag.
What size dry bag do I need?
A 20 to 22 liter bag, like the three here, holds a compressed sleeping bag or a set of spare clothes and a jacket. ORTLIEB’s PD350 holds 22 liters, and the Sea to Summit and SealLine bags hold 20.
Which dry bag is lightest?
The Sea to Summit Big River 20L is the lightest at 8.8 ounces, followed by the ORTLIEB PD350 22L at 10.2 ounces and the SealLine Discovery 20L at 13.8 ounces.
What warranty do they have?
Sea to Summit and SealLine each list a limited lifetime warranty, and ORTLIEB lists 5 years from the date of first purchase.
