Hydrapak Reyes Hydration Pack 100oz (3L) Shape-Shift Reservoir with Plug-N-Play and Quantum Clip Gear Storage: 325 cu. in. (5.3 L) Weight: 16 oz 210D Baby Rip Nylon, 210D Nylon, Hypalon Construction, 420D HD Nylon Bottom Panel Measures 17.5" x 7.25" x 4.25"