I can't seem to keep a travel coffee mug around for long. I lose them or break them constantly it seems. So, I've taken to taking my coffee to-go in a repurposed jam jar. It is the perfect size and the hot coffee makes the lid seal so you don't have to worry about lots of spilling. Kinda genius if you ask me! ;) And I love that it doesn't matter if I forget it on the tram.