Here ya go, brother...
Stanley Wide-mouth Thermos.
I carried that and my Stanley coffee thermos for years. I'd preheat it with hot tap water or boiling water, then heat up whatever I wanted to put in it.
When you're working 200 feet up in 10 degree weather, it sure is nice to go to the trailer and have hot roast beef, taters and carrots.
You can put anything in there. Lasagna, Spaghetti, soup, really anything you eat hot. And it stays hot 100% of the time. Sometimes TOO hot.
You'll fall in love. Seriously.