The Sea to Summit Ultra-Sil Dry Bag Set provides three convenient ultra-lightweight dry storage options for fast and light backpacking, bike touring, and travel. Manufactured from bluesign-approved 30D Ultra-Sil Cordura ripstop nylon, their 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 the low-profile, streamlined oval shape saves space, and resists rolling. The Sea to Summit Ultra-Sil Dry Bag Set includes three dry bags: 3L (measures 6.7 x 5.5 x 8.1 inches when closed, and weighs just 0.07 pounds), 5L (measures 6.7 x 5.9 x 12.1 inches when closed, and weighs just 0.07 pounds), and 8L (measures 7.5 x 6.8 x 14.5 inches when closed, and weighs just 0.09 pounds. Sea to Summit products are guaranteed against defects in materials or workmanship for the lifetime of the product.