Description Osprey 2 Liter Hydraulics® Reservoir is ideal for large-volume packs and long-duration activities. Thoughtful design makes filling, cleaning, and staying hydrated on the trail easier than ever. Hydrostatic backerplate provides structure to shove a full reservoir into a fully loaded pack and maintains a flat profile. Easy Slide-Seal top opening. Pour shield for controlling pouring into pots or bottles. Magnet clip attaches to the reservoir hose for easy water access and hose management.