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Sun on your face, wind in your hair, and the thirst-quenching Viper on your back.

When all you need for a morning on the trails is a few small snacks and plenty of water, shoulder the Osprey Viper 5 Hydration Pack before heading out the door. The two-liter Hydraulics Reservoir  is contoured to match the profile of the AirScape back panel for improved balance and less sloshing while the well-ventilated BioStretch harness ensures you stay comfy after breaking a sweat.

  • AirScape back panel provides cushion and ventilation for trail runs and cross country rides
  • BioStretch ventilated harness features EVA foam padding and spacer mesh for next-to-skin comfort
  • 20mm webbing hip-belt keeps the pack balanced and in place out on the trail
  • Small pack size holds a few snacks or a compressible windbreaker
  • Separate hydration sleeve provides quick access to the reservoir
  • Two-liter Hydraulics Reservoir features a HydroStatic backer plate that maintains a low-and-wide profile, preventing interference with your pack's suspension
  • Reservoir is made from metallocene PE material that is exceptionally strong, taste-free, and BPA- and PVC-free
  • LidLock clip allows you to quickly attach your helmet when not in use
  • Main compartment has pump-specific sleeves
  • Top zippered pocket has a soft embossed fabric for stowing sunglasses and electronics
  • Magnetic sternum buckle pairs with the magnetic bite valve to keep the hose secure while riding

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Here's what others have to say...


Great Pack

  • Familiarity:I've used it several times

This pack is great for hiking or biking. I love it. It has plenty of storage and water for the day.


Excellent Product

  • Familiarity:I've used it several times

Perfect size for what I was looking for. Excellent for day hikes and even music festivals. The bladder does not leak like other products and the magnet is a great perk. Would recommend for anyone.

agreed, don't limit this pack to bike rides!


Osprey Rep


Who needs water? I do!

  • Familiarity:I've put it through the wringer

With a 2 liter reservoir, you can venture out and enjoy nature on just about any activity that doesn't require you to venture through the Sahara. The pack forms nicely to your body, as you will forget your even carrying that life giving liquid when your sweating bullets on that summer summit hike. Great for trail running, mountain biking, or sitting around the house for the lazier of us. A great durable pack for the money. 5 stars


Made by a pack company...Wonderful!

    I have two Osprey hydration packs, this one and a larger one. I absolutely love them both. They are designed so much better than the Camelbaks, as they should be since they come from a great pack company. After looking at several brands and after reading the reviews on each, I decided on the Osprey Raptor. That was my first one, then purchased this smaller one for shorter rides. I love the magnetic mouthpiece holder and the design of the bladder. The handle makes filling easy, and keeps it from sagging to the bottom. The pack has a place for bike tools, a handy helmet mount, and ample space for my rain jacket, energy bars, Gopro accessories, etc. Take a look at how the design of the Osprey and the build quality and I think you will come to the same conclusion.



    • Familiarity:I gave it as a gift but have feedback to share

    I gave this for a gift and all I have heard is how great it is. He runs with it and tells me how glad he has it for training.


    Great Pack!

    • Familiarity:I've put it through the wringer

    This pack is a MTB bikers dream pack. Carries 2 liters of water, pump, clif bars, and a few spare parts. The front fastner has a magnetic holder for replacing the hydration hose which is awesome for when you need a quick drink on a steep uphill climb.

    If you are thinking of using this for XC racing maybe go with another pack because this one is pretty heavy due to the heavy reservoir material; it can make for some sore upper back muscles after 14+ miles.


    Quick Trail ride!

      Perfect pack for 1 to 3 hour mountain bike rides. Enough water and room for a spare bike tube and repair kit.