Hydrapak Big Sur Backpack with 100 oz (3-Liter) Water Bladder Hydration Pack Reservoir and Bite Valve Includes 100oz (3L) Reversible Reservoir II Water Bladder Hydration Drink System Reservoir Includes 36" Big Bore Drink Tube, Plug-N-Play Quick Disconnect, 45deg Surge Bite Valve, and magnetic Quantum Clip Constructed of 210D Baby Rip Nylon, 210D Nylon, and Hypalon Dedicated Zippered Reservoir pocket with an Air Chairman Back Panel Tool Garage Pocket featured on the bottom front panel Dedicated fleece lined Audio Pocket with Cord Port