I've been using this cap for a few weeks now. I had no problems with that at all. No leaks, no cracks on the body or mouthpiece etc. I will say that I have read other reviews complaining about the above and here is what I have to say about that. I can no longer turn the lid. That is unnecessary. Inside is an O-ring that you crush. This will also break the lid itself. Just shut up and leave it alone. The mouthpiece is made of soft rubber at the tip. It's a straw, don't bite it. Keep your teeth away from it. Just use it as usual, it should last a very long time. The package I received contained the following: 2 x straws, 2 x cleaning brush, 1 x O-ring (1 also included in the cap). I would buy it again tomorrow if needed. I am very happy with it.
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