The Osprey UL Dry Sack 20 is a lightweight waterproof storage bag designed to keep your gear dry on camping trips, kayaking adventures or any wet-weather outings. With a 20-liter capacity, it’s meant to fit easily inside your backpack or clip on the outside to protect valuables from rain, splashes or accidental submersion.
Made from recycled 40D Nylon High Tenacity Ripstop, this dry sack balances low weight with strong tear resistance. The ripstop weave stops small rips from growing, while the recycled fabric helps reduce environmental impact. At 20 liters, it’s roomy enough for a sleeping kit, extra layers or cooking gear, yet slim enough to tuck into your pack without wasting space.
Weighing just 0.060 kg, the UL Dry Sack 20 falls into the ultralight category and adds barely any burden to your load. The “40D” rating refers to the denier of the nylon fibers—a measure of thread thickness that keeps the fabric both fine and durable. Its dimensions of 41 × 26 × 20 cm translate directly into the 20-liter volume, giving you a clear sense of how much you can pack without overstuffing.