The Osprey Hydraulics® 3L Reservoir by Hydrapak is ideal for large volume packs and long duration activities, ensuring you stay hydrated all day. Enjoy the HydroStatic backerplate that provides structure for easy loading into a full pack and maintains a flat profile. With Osprey's thoughtful design, it makes filling, cleaning and most importantly staying hydrated on the trail easier than ever. This reservoir is made with BPA-free, phthalate-free, lead-free, guaranteed parts and all materials are certified food safe according to FDA and EU regulations. Stay hydrated everywhere you go with the Osprey Hydraulics® 3L Reservoir.