-0 degrees? wow, mine only keeps it warm all day in +0 degree weather what kind do you have??

Stanley. I will per-heat it with hot water and put some really hot water in it tonight and leave it in the car over night and see what happens in the morning.

Dave

No Kidding: http://www.amazon.com/review/product/B000FZX93K?filterBy=addFiveStar

Dave

OBG, no, you can't. The same properties that keep hot stuff hot and cold stuff cold is working against you. Just carry a metal cup.

Sue

agreed. The insulative properties would keep the heat out and away from the water...to the point where you'd likely damage the Thermos.

What you might be able to do is half fill it with hot water and fill it the rest of the way with snow or ice and let the temperature equalize. Very little heat would be wasted while this equilibrium took place...unlike boiling where as you melt snow and ice, the pot and the water within give off tons of heat into the atmosphere the whole time.

Thermos loaded with 98C water and put out into 6 degree F weather. I first gave it a 10 minute warm up period with some 90C degree water. We will see.

Dave

This is pretty much how I've always done it with a little modification. I have to eat a little more often so generally didn't heat up anything for lunch then do a mid-afternoon meal that I split up and used the other part for my supper.

By doing it later it's always stayed hot even in wide mouth containers and I can have a hot meal without much extra effort. Which also gives me some more flexibility on when I eat in the evening

I also like not having to rush and more time to explore/gather after I've set up camp.

Ok I went out to collect my Stanley thermos and I was kind of afraid that I might have ruined it by letting it freeze. I grabbed it and on heading back into the house I gave it a shake to see if I could feel a frozen ice chunk inside.

I got a nice vacuum "pop" as I removed the stopper and poured the contents out and it was still pipping hot. I would say it went in a little under 98C or 208F and it probably was 130F or so when I poured it out. The temp out side when I put the thermos out was 6F and it did warm to 13F overnight I would the thermos to perform just as well and you will probably use it in a 12 hour span.

I give it 2 thumbs up for sturdiness (it weights at least 1.5 pounds), you really can't break it easily, unless you drive over it and replacement parts are available at Walmart or Target. IIRC I paid 19.00 for my 1.1 quart.

Here is a link: http://www.stanley-pmi.com/shop/product_detail.aspx?ProductID=5

Dave