I use this to hydrate AFTER a run or workout. It does not have a waist belt so it is not stable enough to run with. The shoulder straps are plastic mesh so they stick to my skin and make me sweat more. The bladder is impossible to dry and water just doesn't come out of it and it can't be turned inside out to dry which makes me concerned about bacteria. All of that said, for the price, it can be useful for other applications that don't require stability and if you use a different bladder.
great little pack. looked at more expensive ones but this does the trick. have already used it skiing. small enough that it fits under coat but holds a lot of whatever you are drinking. well made but a little difficult to dry out after cleaning but I am sure they all are
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