Hydrapak Reyes Hydration Backpack - 100oz (Teal) 100oz (3L) Reversible Elite Reservoir with Plug-N-Play and Quantum Clip Measures 17.5" x 7.25" x 4.25" 325 cubic inches (5.3L) gear storage 210d Baby Rip nylon, 210D nylon construction, and 420D HD nylon bottom panel Large main pocket with pump sleeve and zippered organize pocket Dedicated zippered reservoir pocket on back panel with 360 degree reservoir insulation Quick access front pocket with internal pockets, elastic loops, and key clip Dedicated audio pocket and cord port Moisture wicking back panel, comfort padded shoulder straps, slider sternum strap, reflective light loop, and removable waist belt.