It's just the thing for hiking, walking, outdoor chores or any activity where hydration is important. It's so light you won't even feel it. Source® Taste Free™ reservoir tube has a patented bite valve for easy drinking. Reservoir holds 2 liters (67 1/2 ozs.) Gear storage includes a 3D front pocket, stash pocket and front bungee compression. Large zippered reservoir compartment, Filter compatible filler cap, Easy-carry backpack straps, sternum strap, webbing waist belt and carry handle. Constructed of Shadow rip-stop fabric and nylon Kodra Safe reflective accents. Measures 8 x 16 x 2"