The Mazama 2L intake reservoir is an excellent water bladder. I have long been using early model camelback reservoirs for most of my hiking/backpacking until they finally wore out. I was surprised at how much further the technology has come on reservoirs. I greatly appreciate the top opening on this model. Although similar models that have slide on clips to seal the opening are much easier to use than the clip on this model, which requires slipping over pegs on one side and then the other to seal the opening. It is fiddily to deal with and is hard to get right on the first try. The clip off hose (using heavy duty hardware) is also very nice. It makes getting this bladder setup in a backpack a breeze. I hope this new reservoir will last me as long as my previous camelbacks (15+ years).