What you get This waterproof/breathable Sea to Summit compression sack lets air out without letting water in. We use it to keep down bags and clothes dry and to shrink bulky items. It’s reliable, too, with no valves to fail or leak.
Trail cred “I’ve used this sack to carry my sleeping bag on remote hunting trips in Kodiak and on winter snowshoe treks in the mountains above Juneau,” says Alaska tester Jason Boyle. “Wherever I go, I have complete confidence that everything else in my pack can be soaked, but my sleeping bag will be bone dry.”