Hi,
I have a couple thermos' that fit in a bottle holder. One for commuting that can keep coffee hot for an hour or two. And other
that is more like a mug but is made like a thermos. It's tricky, but you can sip and ride. I usually stop tho, I am not that graceful.
If I had a long commute, I think I'd want to find a nice little place
and have somebody else make me one.