The Osprey Hydraulics 3 L hydration system reservoir 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. This reservoir also features a Hydrapak Blaster bite valve offering fast, smooth water flow with a ¼ twist on/off switch. Thoughtful design makes filling, cleaning and most importantly staying hydrated on the trail easier than ever. Furthermore, all parts are BPA-free, phthalate-free and lead-free.