I didn't think my family would remember not to reheat leftovers in their plastic container so I bought several of these.  This was a good choice.  You may think that the lid doesn't quite fit, just make sure to get the edge of the mug into the narrow outer edge of the lid and it snaps right on.  They have also had a lot of use with bringing soup or oatmeal to someone who is sick in bed; the handle and size make it easier to handle.