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.
Used this hiking, running, and cycling and it works as expected. Does not dig into shoulders and the weight is distributed nicely. The loops to hold the hose are a little difficult to work on the run so I'm knocking 1 star off for that.
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