The mugs are very cute, but the inside of the mug follows the shape of the bunny head, so it makes it difficult to wash. Also, the opening of the mug has a pretty significant lip, so the opening circumference is smaller than you would expect and doesn't let you finish the entire drink. I think the way these mugs are made they would work for kids that still tend to spill drinks a little by tilting too mug or get over excited mixing the contents.