Hydraulics 3L Res Space Gray with a smooth

with a smooth

while the included duffel-style storage bag makes pack-up a breeze

and has a soft polyester fleece back

two zippered handwarmer pockets and an internal chest pocket (with clip-in loop) that doubles as a stuffsack

Hydraulics 3L Res Space Gray with a smoothOsprey's Hydraulics 3L Reservoir by Hydrapak 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. 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