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Convenient hydration and just enough space for an extra layer and an energy goo.

Whether it's an epic relay race, steep switchback trail, or a challenging cross country ride, trust your thirst-quenching needs to the Osprey Viper 9 Hydration Pack. The AirScape back panel and BioStretch harness keep the pack from shifting around during fast-paced pursuits and are ventilated to maintain comfort when you break a sweat. Even better, the full-featured three-liter Hydraulics Reservoir is shaped to match the contour of the back panel, which means better balance and less sloshing.

  • 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
  • Pack size fits a compressible windbreaker and a small snack
  • Separate hydration sleeve provides quick access to the reservoir
  • Three-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
  • Stretch mesh front pocket is ideal for stashing a rain jacket or extra layers
  • 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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Osprey Packs Viper 9 Hydration Pack - 549cu in

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Here's what others have to say...

3 5

Great pack, awful mouthpiece.

  • Familiarity: I've used it several times

I love the Osprey Pack Viper 9. However, the mouthpiece broke after one use and started leaking. There is plenty of room for snacks and bike supplies!

4 5

Osprey Viper 9 Video Review

Get Out There Magazine's reviewer Sven Walther put the Osprey Viper 9 to the test and showcases the breadth of features this pack has.

I have last year's Viper 10 and I love it,...

I have last year's Viper 10 and I love it, is this pack worth the upgrade regardless of the money? What does anyone out there who has it have to say about it?

Best Answer Responded on

Also, you can go directly to, and do a compare for both the current model, and the previous years' models.
Click on "past seasons" on the model you're interested in...then look at the speck on the tab at the top of the window.
Then you can compare to the current season's model to see what, if any, improvements have been made.

Hope this helps!