10/31/21 update: I've kept using this - why not? I had it, perhaps despite the chemical flavors noted below and from other buyers. I'm not sure if the chemicals got into my system, but after a few sips and washing, that weird taste went away. Converting a standard plastic bottle into a hydration system is very convenient and there are no leaks. It is limited by the size of the bottle neck. Additional adapter dimensions expand the use. I haven't changed the stars - I'd give it 3.5 now - but that initial odd taste has to be taken into account despite its usefulness. Share water and a few conditioners - the water tastes like plastic. It doesn't leak and I had no trouble getting water out of the bottle. It might be handy for small bottles up to 2 liters, but that's a taste.
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