I've used this camping gear to sleep down to -40 degrees. It's a really dialed in winter camping gear list. WARNING: WINTER CAMPING TAKES SKILL AND GEAR IS A SMALL PART OF SURVIVING OUTSIDE AT EXTREME TEMPERATURES!
Big 3
AMG 75 Pack — 77.1 oz
Nylofume® Pack Liner — 0.9 oz
X-Dome 1+ — 34.7 oz
NeoAir XTherm NXT Sleeping Pad (Large) — 20.0 oz
NEMO Switchback Sleeping Pad — 10.4 oz
Polar Ranger -20 Sleeping Bag — 55.0 oz
Revelation Apex Quilt (50F) — 12.7 oz
Hikenture Pillow — 4.2 oz
Cook System
WhisperLite Universal Backpacking Stove — 13.5 oz
Tomshoo 2L Ti Pot — 9.9 oz
TOAKS Titanium Long Handle Spoon with Polished Bowl — 0.7 oz