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I fund out that if you leave the mouth part open and the bottle is on its side, it leaks. Big bummer being that I have a little one. I know I can just shut it when done drinking but my other covers did not leak. I do like that its not rubber where little one can bite it off. It does fit my 40oz hydroflask.
So my water bottle didn't came with a straw lid which made drinking from the bottle a bit messy. So i decided to buy this brand and it not only fits my bottle perfectly it was easy to assemble and easy to clean. It makes drinking from the bottle now easier and fun.