Maybe it's a seller/packer error but there was nothing on this jar to stop the leak from under the lid. There was a perfect spot for the regular black o-ring, so I went to my local hardware store and bought o-rings for each cap. Now after doing what the seller was supposed to do I have no leaks! Other than that, it's a good mug. It comes with a bottle brush, which is very convenient. The top to show a straw to drink from is a little difficult to open, not very comfortable when walking or driving. It's good if you have two arms and one leg to hold it. (slight exaggeration) However, the plastic will wear down after a few uses, making it easier to drink. But in the end I'm sure it won't be a big effort to keep it closed. Just take a look.
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