Osprey Hydraulics Reservoir Size:3L A lightweight paulownia core is

A lightweight paulownia core is woven with carbon fiber

This ensures they have no slop on those steep icy traverses and will keep you moving uphill with no extra effort

so transitions take seconds

Wide-open straightaways

Osprey Hydraulics Reservoir Size:3L A lightweight paulownia core isReservoirs by Hydrapak are ideal for large volume packs and long duration activities. The HydroStatic backer plate 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. All parts are BPA free, phthalate free, lead free, guaranteed. All materials are certified food safe according to FDA and EU regulations.