NRS HydroLock Grommeted Dry Bag The HydroLock zip-seal closure is 100 Waterproof A roll-down StormStrip top with quick-release buckle doubles as a carrying handle Two corner grommets plus a D-ring on the buckle make this bag simple to secure to your boat 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 The durable clear urethane window ensures you'll quickly and easily find items in the bag