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Prepared for anything.

Sure, that emergency snake-bite kit you have is pretty rad. But during your mountain-bike ride, chances are good you’re going to need access to water, an extra layer, and a tire repair patch long before you’ll have to tend to a set of thin puncture wounds on your calf. With the super-comfortable Osprey Viper 13 Hydration Pack on your back, you’ll be able to tote along the day’s essentials and even have some room left over for less-crucial items, like anti-venom.

  • 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.
  • Wide variety of organizational pockets keep your tire pump, patch kit, and multi tool in place
  • Side compression straps 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 13 Hydration Pack - 800cu in

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Here's what others have to say...

5 5

I take this pack on all my adventures!

  • Familiarity: I've put it through the wringer

I've had this pack for a couple years now. Its compact enough to take on any activity. I use it for cycling, canyoneering, as a daypack hiking, it is very versatile. This pack is what got me hooked on Osprey. I love the helmet feature a ton and love that Osprey is starting to make that feature a standard on their packs.

I take this pack on all my adventures!
5 5

War pack

  • Familiarity: I've put it through the wringer

This pack is great. I've been using it for about two years now and take it on long "death rides". Loads of storage and very light.

5 5

Love it!

  • Gender: Male
  • Familiarity: I've put it through the wringer

This is a great Hydration pack!

I have had about a million, it seems, of different hydro pack over the years, especially in the Army. This pack might be the best one i have ever own( for the money), its super lightweight, but that can all change depending on what you pack in in, it has a ton of room and deep pockets, that you can pretty much pack for an entire day. You also have the ability to expand the width of the entire pack with a few adjustments, i can put a jacket back there no problem. when you don't need to much you can wrench it all down and it becomes pretty compact.

The bladder section might be the best part about it, it doesn't look like it holds a 100 ounces but it does. It also has the this ridged "back bone" to the bladder making it very comfy on your back as it contours to your body. it also prevents water from sholshing all around and keep the bladder in place, no matter what you are doing.

Worth the money by a long shot.

Responded on

You make a great point that I think some/many overlook: the adjustability of these packs! They can also be cinched down when not fully loaded. It really is better to have a slightly 'larger' pack, and have the available room, but also have the option of tightening it back down when not needed.

The Genius of Osprey!

5 5


I absolutely love this pack. The hydration system that comes with this pack is excellent. The magnetic retention contraption on the hose and sternum strap is a feature that I cannot live without. In fact, I have bought the magnet pieces for all of my packs. The pack's best feature in my opinion is the ability to expand it and stuff a jacket or layer in it once things heat up. I do a far amount of technical riding and I have never had the pack's weight to shift and cause me to lose balance. It just seems to stay in place.