Start with the assumption that you’re alone, it’s dark, snowing or raining, and you just broke a leg. Read London’s To Start a Fire to hammer the point home.
I’ve tended to carry a fresh military trioxane bar, but a duraflame log or flare would be nice too.
In the book, it was something like -70. The all time record cold here in Idaho was a 'mere' -60. While most hypothermia deaths happen well above 0 and a lot of those even above freezing, the extreme cold in the book isn't something most hunters will ever experience.
