The Osprey Hydraulics Reservoir 2 Litre provides durable construction without compromising fit, stability or comfort in your backpack. The reservoir is designed with pack-integration in mind, and has a contoured back plate to preserve fit and comfort. Comfortable, stable reservoir water system from OspreyBack plate - for increased comfort and fitAntimicrobial formula - prevents growth of bacteria and moldOn/off valve - rotates for east flow controlMagnetic sternum strap - attach magnetic bite-valve for easy access and storage when not in useMaterial: durable taste-free, BPA and PVC free metallocene polyethyleneCapacity: 2 litresRecommended activity - hiking / cycling