At fist it looked like a clever idea and the drinking valve that only allows water through when you suck on it works well and doesn't leak. HOWEVER, the first time I used it I went to take a drink after a few hours of walking and the water tasted absolutely foul. It had an extremely strong plastic/chemical taste that made the water undrinkable. I tried filling it with very hot water and leaving it for a while, but I could not get rid of the taste, and I'm talking about an VERY strong taste. It's works well provided you drink the water as soon as you've filled the bottle, but if you leave it for a few hours then you can't drink it. So the bottle is utterly useless as a water bottle and God only knows what chemical is leaching out of the plastic.
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