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reply to post by Krakatoa
I don't know...
Down is a great insulator, but it's worthless when it gets wet. Chances are they'll be snow on the ground if it's sub zero outside. The chances of a down sleeping bag getting wet are exponentially higher. Down also clumps up and is just plain nasty to work with when wet.
I went out and bought the warmest synthetic bag I could find. I ended up with a North Face Dark Star, rated to -40F/-40C. So far it's much to warm to use even when it gets down to 0F.
I look to the people climbing mountains like Everest and Mt. McKinley. The harshest conditions in the world can be found up there. If it's good enough for them, it'll certainly keep me alive at sea level.