Hydrapak Tamarack Hydration Pack 100oz (3L) Shape-Shift Reservoir with Plug-N-Play and Quantum Clip 450 cubic in. (7L) of gear storage space Weight: 1.1lb (0.52kg) 210D Baby Rip Nylon, 210D Nylon, Hypalon Construction, 420D HD Nylon Bottom Panel Measures: 18" x 9.25" x 4.25"