Osprey Packs Viper 9 Hydration Pack 549cu in

Whether it's an epic relay race, stiff hiking trail, or challenging cross country ride, trust Osprey's Viper 9 Hydration Pack to satiate your thirst quenching needs. The ventilated Airscape back panel and perforated Biostretch harness not only keep the pack from shifting around during fast paced pursuits, but it also maintains comfort even when you break a sweat. Additionally, the three liter Hydraulics Reservoir is shaped to match the contour of the back panel which means better balance and less sloshing. And to ensure maximum preparation for bike related break downs or unexpected detours on your hike, Osprey added a large zippered main compartment in addition to the hydration sleeve where food, layers, spare tubes, and tools can be carried while the two front pockets make it easy to stash a light rain jacket or trail map for quick access.