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.