Hydrapak’s unique Reversible Reservoir II™ drink system incorporates the easy on, easy off, Slide Seal. The plastic slider forms a complete seal over the folded reservoir top. The reservoir can be turned inside out for complete cleaning and drying. The wide mouth makes adding ice cubes and sport mixes a breeze. The reservoir is constructed of FDA approved durable polyurethane – strong enough that it can be stretched many times its original length without failing. The new Reversible Reservoir II also features the Plug-n-Play connector, a push-button connector allowing the drink tube to be removed from the reservoir for easier filling and cleaning. A shut-off insert valve keeps liquids in the reservoir when tube is removed. The Co-extruded drink tube is constructed of taste-free inner lining combined with a kink-free outer layer. The package is complete with the patented Easy Flo Bite Valve. The softest bite valve on the market delivers high flow with ease and has a simple one-handed push/pull shut-off.