So-so

The shape shifter function is a nice idea in theory, but it's a pain to deal with the middle seam when you want to flip it inside out to dry, which is what they say you should do after every usage. It's equally a pain to try to "shape shift" the bladder from 2L to 3L or vice versa. Also, I've probably only used this a dozen times or so, and the bite valve is already breaking and needs to be replaced, so there's a question of durability. If the above doesn't deter you, then it's a good lightweight option.

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