Osprey Viper 4 Pack

Heading out the door? Read this article on the new Outside+ app available now on iOS devices for members! Download the app.
Osprey’s Viper 4 pack has a trick rigid bladder and handy magnetic retention system for the bite valve.
Heading out the door? Read this article on the new Outside+ app available now on iOS devices for members! Download the app.
Osprey’s Viper 4 pack has a trick rigid bladder and handy magnetic retention system for the bite valve.