The Sea to Summit Ultra-Sil Nano Dry Sack is a featherlight dry storage and organizing option for mountaineering, climbing, alpine adventures, and minimalist pursuits. Manufactured from 15D Ultra-Sil nylon, its reinforced waterproof seams are double-stitched, and tape sealed, with reinforced stitching at stress points; 1,500mm waterhead (the higher the waterhead rating, the more waterproof the fabric). A secure hypalon roll-top closure keeps moisture out, and translucent fabric provides visibility of contents. The Sea to Summit Ultra-Sil Dry Sack’s low-profile, streamlined shape saves space, and its oval base resists rolling. A patent-pending field repair buckle can be replaced in seconds with a Phillips screwdriver. Recommended for use within a pack or duffle. 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.