I'm looking for the most compact go to ground (relatively comfortably) compatible bottom insulation. The idea would be something compact enough to fly with without checking baggage and allow me to sleep above treeline or at sites without trees and have the maximum possible number of campsites available. My current thought was to use my Warbonnet Yeti and get a thermarest prolite extra-small to go under my feet/legs and also for use on the ground. The top priority here is definitely packed volume, not weight. I'm not opposed to using just a pad, or pad spe setup, or even throwing in my pack for some insulation just as long as the system is compact. I'd like the system to be good down to about 30 F (or better). So, what are your thoughts?