Big River Dry Bag 65LDrybags need to be robust, roomy, easy to carry and above all else, waterproof. With their Big River bags, Sea to Summit have ticked all those boxes and more. As well as being completely watertight, they're built tough, using 420D ripstop nylon fabric with a triple coated base for increased abrasion resistance. They're also fitted with low profile grab handles to ensure they're easy to heft into a canoe, onto a bike rack or into the back of a truck.