High-energy activity requires keeping hydrated. That’s why the Viper backpack comes equipped with an integrated 2.5L Hydraulics™ LT Reservoir, so you can push yourself to the limit. The reservoir is accessed via an asymmetric zip for quick and easy refills.
To view the women's version, click here.
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"Versatile and perfect" (Posted on 03/11/2016)
I use it for running and hiking. I wanted something versatile with enough space for my gear. It sits very comfortable on my back and does not jump around when running. In the beginning the sound of the splashing water was a bit disturbing when running, but you get used to it.
There's a perfect pocket in the front which hold my Iphone in a firm grip. ...pockets on the sides and rear.
If you are a runner/hiker that enjoy long hours out there, - this is it. I cannot imagine how they can make them better than this!!!