I think I went down to about -2C or -3C (sorry can't remember fahrenheit) with the Snugpak and an old sleeping bag on top. I took the hammock sock off because at that temperature it was too warm. I've been carrying a Thermarest on this trip as well for extra back insulation. Only ever used it as a stool when there were no rocks or logs to sit on in the woods. Haven't unrolled it once.
The worst I expected to face on this trip was -30C, probably during a treeless stretch in W.China, but I don't think I'll be able to experiment now. How cold does it get in the Rockies in December?!
Flight about to be booked. I'll do a new thread and link to it in here eventually.
Last edited by Gobsh; 10-04-2012 at 05:11..