This is what I carry in winter
inb4 gearfag/fan boy
I know what I am
HPG Ute, kitbag, mountain serape, and windcheater. MLD duomid with a groundsheet from another tent, big agnes air core ultra, inflatable pillow, 15° sleeping bag, black diamond trecking pole. Rain shell (depending on weather), grid fleece top, long John's, extra tshirt, 2 pairs of socks, a buff, beanie, and ball cap. A knife, microspikes, headlamp, battery bank, water filter, 2 smartwater bottles plus and extra 1 liter water bag, small med kit, and a stove with a 700ml titanium cup.
This will get me upwards of 3 nights out and If I need to go longer I toss a pocket on the front for extra food storage. In summer it's pretty much the same except no sleeping bag, fleece, long John's,or spikes. Depending on conditions I also may add an ice axe, snow shoes, or bivy sack