I have a Thermos Stainless King 16oz travel mug and I love it! I can't speak for the larger containers, but the item I have keeps my coffee hot for hours. It's great in the fall/winter months!
go to craigslist or good will and pick up an old stanely or Thermos for 5-10 bucks and be done with it.
thinking about picking up a 1 ltr Stanley but can't decide on whether to go with the Classic or Outdoor. Funny how they don't offer us Europeans lifetime guarantee, we only get 15 years i think... maybe that's considered a lifetime over here?