Thought I'd replied to this thread but can't find it so here goes:
1. REI FLASH Insulated 3 season air mattress - good to 15 F.
2. REI FLASH Insulated All Season (winter) air mattress - good to at least -10 F.
3. Sea to Summit pump bag/dry bag (to pump up the above mattresses, thus keeping my moist and bacteria-laden breath from the mattresses)
4. Eddie Bauer PEAK XV expedition -30 F. down parka (on a 50% off sale) An amazing piece of gear. Very well designed and fabricated.
5. MSR Whisperlite Universal 3 fuel stove (petrol, kerosene and butane canister) changing jets is necessary for each fuel type.
I considered Dyneema solo tents (Tarptent Notch Li or AEON) but the high cost and 1 to 1.5 lb. weight savings was not worth it. I'll just lose that weight off the "love muffin" around my waist, thank you very much. Besides, I "need" to buy a new Leica HD-B 2200 laser rangefinder binocular for hunting out here in the wide open spaces of Nevada. (Yeah, I know, they are far more "spendy" than a Dyneema tent.)
I now have over 100 Kg. of Ultra Light backpacking gear.
Eric B.