Osprey Packs Viper 9 Hydration Pack - 549cu in - $98.95

Whether it's an epic relay race, steep switchback trail, or a challenging cross country ride, trust your thirst-quenching needs to the Osprey Viper 9 Hydration Pack. The AirScape back panel and BioStretch harness keep the pack from shifting around during fast-paced pursuits and are ventilated to maintain comfort when you break a sweat. Even better, the full-featured three-liter Hydraulics Reservoir is shaped to match the contour of the back panel, which means better balance and less sloshing. - $98.95

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