Hydrapak Laguna Hydration Backpack - 100oz (Grey/Red - 100 oz) 100oz (3L) Shape-Shift Reservoir with Plug-N-Play and Quantum Clip Measures 18" x 9" x 6.75" 600 cubic inches (9.8L) gear storage 210d Baby Rip nylon, 210D nylon, hypalon construction, and 420D HD nylon bottom panel "Strap Down" system on front of pack with 2 side straps and large horizontal strap to hold helemt Large main pocket with pump sleeve Stash pocket behind front applied packet Dual webbing straps on bottom panel to carry extra load Dedicated zippered reservoir pocket on back panel with 360 degree reservoir insulation