The HydraStorm Matrix is probably the most versatile recreation pack on the planet. It was designed with the extreme outdoorsman in mind. Tapered to fit the body and stay steady during extreme activities, the Matrix has numerous storage/attachment points for such items as carabiners, ice axes, bike pumps, etc. Aerodynamically shaped to minimize wind surface when dangling on the edge of a cliff. With the outer compression panel your jacket can be readily stowed for quick retrieval. Threaded shock-cord on the face allows for rapid access of odd shaped items. Semi-rigid side access handles provide quick access to axe's, 'biners. The Matrix has an IVS Intercooler Venting system molded back panel, which provides greater comfort, stability, and airflow along the back. The bottom of the pack has HawkTex non-slip abrasive resistance material, which provides excellent durability. If you think fun is taking the bike to the woods for an 8 hr. ride or a day of ice climbing, this pack is for you. Dimensions: 20" x 10" x 7.5". Cubes: 1920"