Thanks, @hikermor 

The bivvy option is interesting, especially given the limited volume in my ski backpack. Definitely worth a try on a short-range trip within the reach of the parking lot if things start going sideways. If it adds 10-15 F of warmth rating, I think I might be good with 20F sack. I am a hot sleeper, an often need to actually cool down to fall asleep.

THanks,

 

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