
I filled it with lukewarm water and made sure no water got in from the outside. I turned it sideways on a paper towel and it had water stains on it. I've done this a few times to make sure it really flows. The leak isn't very big, but it's being filled with urine, so that's bullshit. I had to use it when camping in a tent so it could be turned sideways, upside down, etc. So it just doesn't work for me. Maybe you would be fine using it in a car where it always stands upright. I liked the design.

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