The Sea to Summit Big River Dry Bag Backpack offers easily portable, robust dry storage, for river trips in a kayak, canoe or raft, as well as motorcycle tours, bike packs and other outdoor adventures. Made of lightweight waterproof TPU coated 420D nylon, with a 10,000mm water head (the higher the water head rating, the more waterproof the fabric), and a triple coated base for stability. The adjustable EVA foam package features a supportive chest strap and a removable 1.5" wide waist belt. Its reinforced waterproof seams are double stitched and sealed with tape, and the secure Hypalon roll-top closure features D-rings for easy attachment, easy to grip handles that won't get stuck, and multiple lash points for attachment and stacking. The Sea to Summit Big River Dry low profile backpack streamlined shape saves space, its oval base resists rolling and the white laminate interior makes it easy to see the bag contents. A patent pending field repair buckle can be replaced in seconds with a Phillips screwdriver. Available in two sizes: 50 litre backpack measures 13.5 x 11.2 x 23.6 inches when closed, and weighs 1.8 pounds; 75 litre backpack measures 14.5 x 13 x 26.6 inches, and weighs 1.8 pounds. Sea to Summit products are guaranteed against defects in materials or workmanship throughout the life of the product.