Ryan
Somehow you seem to have gotten some very deep advice from some real winter experts - head it well when the time comes. I too have spent time out at -40 (-40C = -40F) and it is simply not fun, not for an extended trip of a week. From your words I think you are much too new at this to be serious and are sort of dreaming a bit. No problem, "have dreams and live them" (Doby Gillus). <img src="/forums/images/graemlins/grin.gif" alt="" /> I did the same and when I got to Alaska with a 5 pound down bag in the summer I questioned my reality analysis a bit. Start easy, you can die in weather like that and not even know it.
So I guess I'll add - don't skrimp on insulation under you, have a pee bottle, an consider that your mouth, moustache, nose, throat may freeze. I found that a rabbit hide over my face and breathing through as much fur as possible, warmed the air I breathed and my face. <img src="/forums/images/graemlins/shocked.gif" alt="" /> <img src="/forums/images/graemlins/tongue.gif" alt="" /> <img src="/forums/images/graemlins/grin.gif" alt="" />
Jim <img src="/forums/images/graemlins/cool.gif" alt="" />