Hydrapak Big Sur Hydration Pack Hydration Pack Includes 100 oz (3L) Shape-Shift Reservoir/Bladder with Plug-N-Play, Quantum Clip and Bite Valve Gear Storage: 450 cubic inches (7.3L) Weight: 1lb 4 oz. Measures: 18 x 9.25 x 4.25 210D Baby Rip Nylon, 210D Nylon, Hypalon Construction with 420D HD Nylon Bottom Panel