Title: Grows bacteria!
Review: The style and size are very nice. HOWEVER, after a year of use, we noticed a funky smell from inside the cup. No amount of washing would get rid of it. Then we noticed if we pushed the rubber ring seal on the inside of the mug, black mildew oozed out from underneath the seal. There is no way to clean the gunk from under the gasket/seal, so we had to toss.
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