The next generation of reservoir is here. Redesigned from tip to tail, the Osprey Hydraulics reservoir features innovative and ergonomic improvements that make it easier to carry, fill, load up and use-whether you&';re buzzing around town, travelling or hitting the trails. This version features a lightweight yet sturdy backer plate that helps reduce bending or buckling while loading, making it ideal for internal or external pack hydration sleeves. Features Compact bite valve provides excellent water flow Thumb-operated on/off lever is easier than ever to operate with one hand Compact Slide-Seal(TM) opening aids one-handed filling, removes bulkiness, slides into packs easier and seals securely Seamlessly integrates with new HydraClip reservoir hanger in packs for secure carry Exceptionally secure hose magnet system Center baffle and backer plate flattens the profile while carrying stiffness through to the front panel, reducing bending and buckling while loading. Weight (3L): 0.52 lbs.