100% polyester. Waterproof. Sewn with TPU-processed polyester for durability. Two top handles. Roll-top opening. Hidden front pocket. Air valve. Outdoor enthusiasts are always in need of a proper dry bag, one that is sure to keep your goods safe and secure. Snow Peak delivers with the Dry Boston style, which is sewn with TPU-processed polyester using the welder crimping technique for supreme durability and waterproofness. A handheld option, the bag is equipped with dual top handles and features a traditional roll-top opening, with a hidden front pocket and functional air valve.