My son has ASD and is obsessed with the solar system. He doesn't like variety either, but he liked this mug. As soon as he saw that he got excited and he's been drinking more since I got it so I know he's really dehydrated now. Have never used it for anything warm but keeps cool for a long time. There were no leaks and he would leave his cup anywhere. Very easy to clean. *Update* Just wanted to come back and say that after reading some leaked reviews I would like to say that I have bought and received my second mug since my last review because we loved it so much and I still haven't had one. was still leaking and every other cup we used leaked. I bought a mug with a straw and when the straw is in place it seals tight. I've also seen where others have said it's difficult to clean, I hand wash and use a straw brush on the straw and straw holes in the lid. Give these mugs a try before you let 1 or 2 negative reviews sway your decision.
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