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On-the-go H20.

Hit the trail prepared when you head out with the Osprey Viper 4 Hydration Pack. This hands-free hydration system stores up to two liters of water and can tote the other essentials you’ll need during your trail runs, rides, and hikes.

  • HydraForm reservoir is made with BPA- and PVC-free materials and features a design that squeezes your water supply for easier drinking
  • SpacerMesh back panel provides super-light cushioning for a comfortable fit
  • BioStretch shoulder harness system features mesh-covered foam for superior comfort and small sleeves to hold your energy gel pouches
  • LidLock helmet clip feature allows you to attach your bike helmet to your pack for hands-free storage.
  • Rear bungee system helps reduce pack volume if you’re carrying a smaller load
  • Reflective detailing on front panel and a blinker-light attachment loop help keep you visible

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Osprey Packs Viper 4 Hydration Pack - 250cu in

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Here's what others have to say...

Unanswered Question

would this fit a small 8 year old?

Posted on

would this fit a small 8 year old?

4 5

Osprey Viper

Great light pack....The weather is hit and miss in Vancouver British Columbia, so it is great to have a pack like this to carry your emergency jackets on long road bike rides....

Responded on

This pack has also been great on short 1-2 hour mountain bike rides.

5 5

Great hydra pack

Great hydra pack with nice fabric and sits well on the body.