Ultralight 20-liter roll-top/compression strap dry bag with an air-permeable base—air can be pushed out, but water can’t get in—and three straps for even compression of gear for backpacking, camping, and water sports Manufactured from bluesign-approved lightweight Ultra-Sil 30D ripstop nylon, with a non-PFC DWR finish; 2,000mm waterhead (the higher the waterhead rating, the more waterproof the fabric) Reinforced waterproof seams are double-stitched, and tape sealed, with reinforced stitching at stress points; secure hypalon roll-top closure with three compression straps featuring two ladderlock and one side release buckle Patent-pending field repair buckle can be replaced in seconds; round base with exterior lash points for attachment to kayaks, boats, packs, and bikes 20-liter compression dry bag measures 9.5 x 9.5 x 18.7 inches when closed, and weighs 0.24 pounds; volume is 20 liters (with closure rolled three times)