![Osprey Packs Hydraulics 3L Reservoir Blue](http://www.walkaboutoutfitter.com/cdn/shop/products/63-984911-0-image-1367364_640x640.jpg?v=1627989101)
Osprey's Hydraulics 3L Reservoir by Hydrapak is ideal for large volume packs and long duration activities. The HydroStatic backerplate provides structure for easy loading into a full pack and maintains a flat profile. Thoughtful design makes filling, cleaning and most importantly staying hydrated on the trail easier than ever.