I have Stanley's in pint, quart, and 2 quart sizes They all work fine, and as said, size matters as does preheating. Also wrapping them up in spare clothing or whatever will keep contents hotter longer. I've other brands as well that work as well, but Stanley has name brand recognition and known quality. I've been using the quart one since 1975 beat up, on 2nd up, third paint job(black automotive wrinkle) and 3rd stopper, but still working. Solid stoppers hold heat much better than the pour throughs.
Actually, the first Stanley quart that I had only lasted a year before developing a leak in the inner liner, but Stanley replaced it at no cost, and quickly.
I never did tell the it was left under the snow machine hood for a week in below zero weather while I was out of town....
