100% Nylon Ultra-lightweight 20-liter roll-top dry sack is the ideal dry storage and organizing option for fast and light adventuring when backpacking, bike touring, or travelling Manufactured from bluesign-approved 30D Ultra-Sil Cordura ripstop nylon with a slippery finish for easy packing; 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; fabric is translucent for visibility of contents Low-profile, streamlined shape saves space, and oval base resists rolling; patent-pending field repair buckle can be replaced in seconds 20-liter dry bag measures 10.6 x 9.3 x 18.6 inches when closed, and weighs just 0.13 pounds; volume is 20 liters (with closure rolled three times) The Sea to Summit Ultra-Sil Dry Bag is an ultra-lightweight dry storage and organizing option for fast and light backpacking, bike touring, and travel. Manufactured from bluesign-approved 30D Ultra-Sil Cordura ripstop nylon, its reinforced waterproof seams are double-stitched, and tape sealed, with reinforced stitching at stress points; 2,000mm waterhead (the higher the waterhead rating, the more waterproof the fabric). A secure Hypalon roll-top closure keeps moisture out, and a patent-pending field repair buckle can be replaced in seconds with a Phillips screwdriver. The translucent fabric makes it easy to see what’s inside the bag, and its low-profile, streamlined oval shape saves space, and resists rolling. The Sea to Summit Ultra-Sil Dry Bag is available in six sizes: 3 liter, 5 liter, 8 liter, 13 liter, 20 liter, and 35 liter, to carry everything from small essentials to group gear. Sea to Summit products are guaranteed against defects in materials or workmanship for the lifetime of the product.