Published June 7, 2011 12:00AM
Osprey Viper 4 Pack
<i>Outside</i> reviews the best gear in the 2011 Summer Buyers Guide, including the Osprey Viper 4 Pack.
Osprey Viper 4 Pack (Photo: Courtesy of Osprey)
Osprey’s Viper 4 pack has a trick rigid bladder and handy magnetic retention system for the bite valve.
