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Item #: 331963537

Osprey’s Viper 13 is the right choice when you’re out for a big ride in the mountains or the desert. You’ll pedal in comfort with the foam framesheet spreading the load across a ventilated mesh backpanel. The BioStretch™ shoulder harness provides a contoured fit. The webbing hipbelt is removable to shave ounces while upper and lower side compression straps offer additional stability if you’re carrying extra weight.


  • Dual upper side compression straps help stabilize the load
  • Front panel shove-it pocket with zippered organization pocket helps gear accessible and systematized
  • An elasticized LidLock™ helmet attachment system provides storage for your helmet
  • The blinker light attachment strap found near the base of the front panel of the pack allows for quick light attachment for high visibility in the dark
  • Hydration sleeve with direct access zip offers fast loading. Hydraulics™ 2.5L LT reservoir included
  • Stretch mesh harness pocket provides easy access to energy snacks and other quickly needed items
  • Dual stretch mesh side pockets provide additional storage for essential items
  • Dual upper side compression straps help stabilize the load while lower, cross functional compression straps also serve as external gear carry straps
  • Front zippered stash pocket with heat embossed scratch-free lining safely holds sunglasses or phone


  • Weight: 580 g (20.5 oz)
  • Volume: 13 L
  • Dimensions: 18" x 9" x 9" (46 x 23 x 23 cm)