A special backpack with a lightweight construction and a water reservoir ideal for extremely demanding endurance sports. Main zippered pocket, outer mesh pocket, elastic drawstring on the front panel. Shoulder strap padded. Anatomically shaped straps. Adjustable chest strap.A special backpack with a lightweight construction and a water reservoir ideal for extremely demanding endurance sports. Main zippered pocket, outer mesh pocket, elastic drawstring on the front panel. Shoulder strap padded. Anatomically shaped straps. Adjustable chest strap.