Osprey hydraulics 3l reservoirospreys hydraulics 3l reservoir is ideal for larger volume packs and longer duration activities the hydrostatic backer plate enables easy loading into a full backpack and maintains a flat profile bpa free lead free reservoirthe thoughtful design makes topping up cleaning and keeping yourself hydrated on trails simple all the parts are phthalate free bpa free and lead free all materials used in the production of the hydraulics 3l reservoir are food safe cer