This is what I use, a sealing insulated cup. Let it roll around on the floor, nothing will spill and it keeps your coffee hot for hours.

Joe Moe Coffee Mug
http://www.amazon.com/JOEmo-Original-Coffee-Travel-Highwave/dp/B001AYQ8B0

I also have a Stanly Insulated Thermos that I use when going to car shows, fits in the boot well.

Stanley Vacuum Bottle
http://www.amazon.com/Stanley-Classic-Vacuum-Bottle/dp/B00VRSJVSG

Charlie, Former Editor
Morgan Owners Group - Great Lakes