Many have complained that the size of the hole that the hydrator hose goes through is too small. I have a camelback system and just removed the detachable mouthpiece before running the hose through the hole. It's easy enough to replace. The only caveat with this method is that you probably don't want to remove/replace the mouthpiece every time you want to fill or empty the water bladder, but the hose is very long so it's not very difficult to fill/replace with it. deflate the bladder from the backpack, and the hose is still threaded through the hole. I get very hot when hiking and need a backpack that keeps my back out. I love this backpack!
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