Outdoor Research Double Dry Window Sack Hydroseal coated nylon is waterproof and durable with waterproof taped seams with inner and outer roll-top waterproof closures for greater protection from leakages; secure and nearly submersible See-thru urethane window provides greater visibility of bag contents. Durable buckle secures roll top Dimentions: 14 1/8" x 7"/36 cm x 18cm Volume: 610 cu in Avg weight: 6.8 oz/193g