The Osprey Viper 13 Pack is a hydration pack for biking, running, and hiking your favorite weekend trails. The Viper 13 provides the most space in the series and includes a 3L Hydraulics™ reservoir with direct zip access into the backpanel for three or more hours in the saddle or on foot. Your largest items panel load into the main section of the pack, while smaller items can be organized in the front panel or top slash pocket. The BioStretch™ harness is cushy and breathable against the shoulders while the webbing hipbelt stabilizes the bag as you move in the saddle and walk uneven trail.
So sorry, but only 4 items are allowed for comparison, so we're comparing the first 4. I blame the gnomes and so should you.
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