The Sea to Summit Ultra-Sil Dry Sack is an ultralight dry storage and organizing option for backpacking, bike touring, and travel. Manufactured from 30D Ultra-Sil Cordura 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. The Sea to Summit Ultra-Sil Dry Sack features translucent fabric for visibility of contents, and its cylindrical shape has an ideal height-to-width ratio for easy packing. A patent-pending field repair buckle can be replaced in seconds with a Phillips screwdriver. Dry bag available in seven sizes: 1 liter, 2 liter, 4 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.