`- Small pack built with HexLite 210 and Super Polytex 600 and a Mylar lined main compartment to keep your water cold or to insulate against freezing in low temperatures\n- Features the Airstripes Back System and a 3M Reflective safety blink loop\n- Highly breathable mesh shoulder straps with anti-chafe pads, zip valuables pocket\n- Hydration system included 2.0 (2.0 L=70 oz, 9D-990120), 3.0 (3.0 L=100 oz, 9D-990130)\n- Dimensions (H x W x D): 2.0 (16 x 7 x 3" / 40 x 15 x 5cm), 3.0 (18 x 8 x 3" / 45 x 27 x 7cm)