NRS Sea-Stows are especially Great for kayaking. 70-denier urethane-coated nylon keeps the weight of this bag to a minimum, and the rugged material slides easily in and out of fiberglass and polyethylene kayaks. Has a durable clear urethane window for convenience and H2Oproof StormStrip closure that doubles as a carry handle. Includes handy D-ring. Measurements are taken when bags are closed and laid flat.