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.
I bought these mostly for the price - fantastic for my husband and I to bike with. I actually used it the other day to hold keys and a cell phone and didn't use the hydration feature. The bladder is another reason I purchased it - the opening is large enough for my husband to get his hand in (for cleaning). I really like the two strap feature so it doesn't slip around during climbs or heavy rides.
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