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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.

Access your gear in the main compartment via the zippered front panel. You can slip small items into the dual side mesh or harness pocket or stash a layer in the front fabric shove-it pocket for quick access. There’s even a scratch-free slash pocket for your shades.

Bike-friendly features include a Hydraulics™ LT 2.5 liter reservoir with magnetic bite valve retention, internal bike pump storage loops, and Osprey’s innovative LidLock™ helmet attachment system.

Key Attributes


A dedicated hydration compartment with direct zip access for easy loading includes a Hydraulics™ LT 2.5 liter reservoir with magnetic sternum strap bite valve attachment.

LidLock Helmet Attachment System

When you’re at the brewpub celebrating a great ride, the LidLock™ system connects your helmet to the pack so you can retain possession of both after a couple of lagers.


Ultralight with minimal body contact for a fit that feels like it’s not there.


  • Upper Side Compression Straps - Dual upper side compression straps help stabilize the load
  • Front Shove-It Pocket - Front panel shove-it pocket with zippered organization pocket helps gear accessible and systematized
  • LidLock™ Helmet Attachment - An elasticized LidLock™ helmet attachment system provides storage for your helmet
  • Blinker Light Attachment - 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 Compartment - Hydration sleeve with direct access zip offers fast loading. Hydraulics™ 2.5L LT reservoir included
  • Harness Pocket - Stretch mesh harness pocket provides easy access to energy snacks and other quickly needed items
  • Stretch Mesh Side Pockets - Dual stretch mesh side pockets provide additional storage for essential items
  • Upper and Lower Side Compression - Dual upper side compression straps help stabilize the load while lower, cross functional compression straps also serve as external gear carry straps
  • Front Stash Pocket - Front zippered stash pocket with heat embossed scratch-free lining safely holds sunglasses or phone

Carry Information

Atilon foam framesheet

  • Atilon foam framesheet allows dynamic body movement while it spreads load across the entire back panel

Airscape™ Backpanel

  • Mesh covered ridged foam allows maximum ventilation while keeping the load close to the body

Biostretch™ Harness

  • Mesh covered die cut foam provides an active and contouring fit and ventilation

Webbing Hipbelt

  • Removable 20mm webbing ride stabilizing hipbelt


  Volume Dimensions Weight
O/S 793 in3 / 13 l 18h x 9w x 9d in. 1.28 lbs.
O/S 793 in3 / 13 l 45h x 23w x 24d cm 0.58 kg
210D Poly Honey Comb
420HD Packcloth
420HD Packcloth
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Good pack, absolutely terrible bladder


Me and 3 of my friends all bought the verve 9L a little over a month ago. We use it mostly for mountain biking (3-4 times per week) So far, 3 of us (including myself) have had to replace the mouth piece because it cracks super easily, causing water to leak everywhere. I have gone through two of these mouthpieces. No, none of us are bitting super hard or have ultra sharp teeth. Today the bottom of my bladder started to leak and by the end of my ride My back was completely soaked. Not fun. :( I really like this pack comfort wise, but I might end up going back to my Camelback since it is more reliable. I really did expect better quality from Osprey since I have two of their other expedition packs which are phenomenal.

British Columbia, Canada


Great pack


I actually use this when I have a day hike in combination with rock climbing. I can fit my harness and shoes inside, along with two large bottles of water and some snacks. I usually just clip my helmet to it and let it hang. I have also climbed with it on and I did not find it cumbersome at all.

Chicago, IL


Holds a bunch of stuff


I bought this to update my old hydration pack that was 20 yrs old because it was time to be able to carry more gear. I was pleasantly surprised to find out that I could also use the bag for commuting to work as it would hold my work clothes and my lunch inside the main pocket. If needed I could also just use the compression straps and hook my lunch bag to the outside. The side pockets are great for holding a couple of energy bars or gels. I did find that when i started filling all the pockets I wasn't able to use the space between the two front pockets to hold bulkier items. Construction and materials used seem to be very good and would recommend.




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