Ultralight, waterproof 40D silnyl fabric * Spacermesh shoulder straps are supportive and breathable, sternum strap with emergency whistle * Roll-top waterproof closure * Large exterior pouch, durable ice axe sleeve with single-hand release * Dimensions-Rolled: 20 in. x 11 in. x 7 1/2 in./51 cm x 28 cm x 19 cm Volume: 1770 cu. in./29 L