damn i wish i would have known about the hydrapak before i replaced my reservoirs for my camelbaks! reminds me of my old ultimate direction hydration pak which was so easy to clean because one end was completely open and you can stick your whole arm inside to clean. then you just roll it up and secure with velco flap. surprisingly never leaked unlike my stupid camelbak! hate that screwtop cap! the new antidote reservoirs are a big improvement though. if you get a camelbak make sure you get a newer model with the antidote reservoir. quarter turn open and closing, quick release for the tube like the hydrapak and the cool thing is you can disconnect the hose with a full bladder and it won't leak!