I hike often and purchased my Osprey bladder over a year and a half ago and love it. I've never had any issues with it... except for the fact that Osprey did not make bite valve covers. I see now they do (*super* excited!) but it seems there is no way you can purchase them as purchases for this product cannot be made on Osprey's site and they do not carry it in stores... so I'm confused. As far as comments saying it should come with the bladder, of course it should; however, none of the other brands have covers that come with the bladders so it is not just an Osprey decision. Simply put, it is a way companies make money.