Hydrapak E-Lite Vest Hydration Pack, 50 oz (1.5 Liter) Includes 1L (32oz) Reversible Reservoir II Water Bladder Hydration Drink System Reservoir Includes 36" Big Bore Drink Tube, Plug-N-Play Quick Disconnect, 45deg Surge Bite Valve. Weighs just a mere 9.9 ounces Features 2 Exapandable front zippered pockets and 4 holsters on the front straps. Rear pouch can carry the included 1L reservoir or can be used for light storage Ultra-Light Weight materials