Ultradurable dry bag backpack features adjustable EVA foam pack harness with supportive sternum strap and removable 1.5-inch webbing hip belt Manufactured from lightweight, waterproof TPU-coated 420D nylon, with a triple-coated base for strength; white laminate interior for better visibility of bag contents Reinforced waterproof seams are double-stitched, and tape sealed; secure hypalon roll-top closure with easy-grab handles, and multiple lash points for gear attachment and stacking Low-profile, streamlined shape saves space, and oval base resists rolling; patent-pending field repair buckle can be replaced in seconds 30-liter backpack is ideal for kayaking, canoeing, rafting, and motorcycle touring; measures 11.4 x 8.7 x 21.7 inches when closed, and weighs 1.5 pounds; volume is 30 liters (with closure rolled three times) The Sea to Summit Big River Dry Bag Backpack offers easily portable, heavy duty dry storage, for river trips in a kayak, canoe, or raft, as well as motorcycle touring, bike packing, and other outdoor adventures. Manufactured from lightweight, waterproof TPU-coated 420D nylon, with a 10,000mm waterhead (the higher the waterhead rating, the more waterproof the fabric), and a triple-coated base for strength. The adjustable EVA foam pack harness features a supportive sternum strap and a removable 1.5-inch webbing hip belt. Its reinforced waterproof seams are double-stitched, and tape sealed, and the secure Hypalon roll-top closure features D-rings for easy attachment, easy-grab handles that won’t snag, and multiple lash points for gear attachment and stacking. The Sea to Summit Big River Dry Backpack’s low-profile, streamlined shape saves space, its oval base resists rolling, and the white laminate interior makes it easy to see bag contents. A patent-pending field repair buckle can be replaced in seconds with a Phillips screwdriver. Available in three sizes: 30-Liter backpack measures 11.4 x 8.7 x 21.7 inches when closed, and weighs 1.5 pounds; 50-liter backpack measures 13.6 x 11.2 x 23.8 inches when closed, and weighs 1.7 pounds; 75-liter backpack measures 14.4 x 13 x 26.6 inches, and weighs 1.8 pounds. Sea to Summit products are guaranteed against defects in materials or workmanship for the lifetime of the product.