Keurig mug keeps coffee warm for a long time. Has enough room for honey and oat creamer.

It seals well and is very easy to clean. Cleaning, its a pain but not hard. My only suggestion is that they offer a ceramic coated version.

The handle is thin and rectangular, making it unpleasant to grab or stick your hand into. The hole is too small, especially considering it doesn't have a 2nd opening for air, (so when you try to drink the liquid just barely dribbles out) the top leaks...  Read More

When there’s hot liquid inside the mug, the lid slowly slides up, and eventually pops off. They are very small and the insulation is thin. It just sits there and holds bacteria.

No matter how much you try to soak or flush out that area with hot soapy water, it develops a film of gunk that does not come out. But not stains.