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Here's what other sites are saying:
When all you need for a morning on the trails is a few small snacks and plenty of water, shoulder the Osprey Viper 5 Hydration Pack before heading out the door. The two-liter Hydraulics Reservoir is contoured to match the profile of the AirScape back panel for improved balance and less sloshing while the well-ventilated BioStretch harness ensures you stay comfy after breaking a sweat.
Bike, hike, or run with the Viper 5, one of Osprey's most compact hydration packs. For quick rides or runs, the Viper 5 includes a two liter hydration reservoir to keep you properly hydrated during your venture. The panel loading design makes packing a breeze, and external pockets make accessing quick snacks or other essentials as easy as ever. PRODUCT FEATURES: ErgoPull Hipbelt Hydration LidLock Panel Load Access Shove-it Pocket Top Slash Pocket Zippered Front Panel Pocket
- Appalachian Outdoors
The compact Osprey Viper 5 hydration pack is built for short and fast mountain bike rides, offering a low-profile design and a 2-liter hydration capacity to quench your thirst as you rail trails.
The most compact in the Viper series, Osprey's Viper 5 Pack with Reservoir is the most useful for short and fast mountain bike rides and is also an ideal hydration pack for fun trail runs and day hikes. An easily accessible hydration sleeve makes it easy to load the included Hydraulics reservoir while the panel loading pack makes loading a snap. The Viper's LidLock makes it easy to secure a helmet to your pack.
- Mountain Gear
The most compact in the Viper series, the Viper 5 from Osprey is the most useful for short and fast mountain bike rides and is also an ideal hydration pack for fun trail runs and day hikes.