Geigerrig RIG 500 Hydration Pack Sprays, Filter Ready, 2 Liter (70 oz.) Hydration Engine, Reversable Dishwasher Safe Reservoir 500 Cubic Inches of Pack Capacity. Light Weight, Removable, Internal Pack Frame. Made from heavy duty Ballistic Nylon, padded pack straps, heavily padded and ventilated back panel. Vertical attachment loops on pack face for hanging gear and tying down and Ergonomic fit, terraced overlaid shoulder straps for adjustable tube configuration Two additional vertical zip pockets for essentials