Coffee mug did have a lid but was not a "Vacuum mug".
Kept your coffee pretty hot though. At the time I was travelling a lot (pretty much every week for two or three days) and I used to catch a plane at 6am. Got up, made coffee, had shower, got dressed, got in car and started driving. I used to drink the coffee on the way to the airport and it was always hot :-)
FFXIV: Crafty Hallie, Ultros