BTW,
Last week I did a winter camp and with a heavy 7 1/2 lb. Dana Terraplane pack and a 2 person TT Scarp 2 tent (I was testing its snow load capability with 2 optional crossing poles) 2 liters of water and an MSR Whisperlite Universal stove in gas mode (1 pint of gas) my pack weight was 38 lbs.
I had an LL Bean -20 F. down bag and a light REI 3 season FLASH Insulated air mattress. Also a relatively heavy Eddie Bauer PEAK XV down parka for camp use.
So not an UL load but my average winter gear plus that 2 person tent and 2 X-ing poles. The 2 L. of water was B/C I needed some for starting snow to melt in my 1 L. pot.