Freestanding 3 man (or 2 plus gear) 4 season everest quality tent. Had it for decades and never had anything fail. Fly has a waterproof bucket extending 1' above ground. Can be setup above treeline. Poles slide into sleeves on the fly so no stress points at clips. Last trip ended with a blizzard hitting 3 AM at 10000 feet, had no issues, warm. Can get a vestibule for changing/cooking and has guy lines for additional stakes if needed. Sometimes don't use any stakes at all but people have been blown off glaciers. You can pile up snow blocks or rocks to help with wind. Use a cheap sheet of plastic under the floor to prevent dirt, pine pitch, punctures etc. Weighs about 9 pounds, and if you can't pack that (esp. with a buddy) best to stay home. Cost a lot back in the day but cost/year is almost nil - spend more on ice. Firm believer in buying quality and enjoying the very best whilst saving money in the long run. Can be setup with just the fly for bugproofing. Got it from a brand that has gone total earth shoes/climate change activist and won't do business with them anymore. Just look at everest base camp pics and you'll see rows and rows of similar tents.
Thermal rest pad under a -40 deg. 600 loft down bag that I store in a very large sack but packs into a very small one. You will want a down bag that has no sewn-thru seams or it will be useless. Washing it is a very tricky task due to the fragile compartments. Have had it for decades as well.
Boots are Norwegian welt with vibram soles. Very heavy leather. I seal the stitches for the soles and wax the leather above. Are on their second set of soles. Use gaiters for brush, snow etc. Those boots with the glue-on soles - have had similar soles melt apart out in the desert.
Keep the Isobutane cannisters for the stove in the sleeping bag. Isobutane is better than butane for the cold, both are much lighter than propane tanks.
Internal frame pack that converts to essentially one very large compartment for hauling out game.