I have a pair of 25 year old Stanley thermos’ that work great, especially if preheated like suggested earlier. And when I say “great”, I’m talking fill them both up Friday after work, drive to camp and have piping hot coffee Saturday morning AND fairly hot coffee Sunday morning.
If one ever gives up the ghost, I will replace it with a Yeti though… the newer Stanley’s don’t cut it. My wife and daughters bought into the Stanley fad, and none of their drinkware keeps stuff cold anywhere near as long as my Yeti’s.