Slumberjack -20* Holofill-II mummy bag purchased new from Gene Taylor's in Gunnison, CO in August, 1984 ($129 if I remember correctly). Dad was sick of me always complaining about always being cold sleeping so told me I had one shot to pick out a brand new bag of my choice from any on the rack on our way through in the cabover camper rig. Dad bought it for me on my 16th birthday on a scouting/fishing trip to that area.
Bag now has a few patches and is a bit worse for wear, permanent stains of archery facepaint at the head, might still smell like a batch of bad chili from 1998, but is still VERY warm and the bag of choice when needed for sleeping in the camp trailer (when too lazy to make a bed solo) or back of my truck. Gets washed once a year and dried with a couple of tennis balls in the dryer once every 5 years whether it needs it or not. Hate to wear it out by washing it too much.
Doesn't get used in backcountry tents anymore. Have a lighter weight option for that now (since 2018 LOL). I think there's even a photo of that bag in one of my first articles here on Rokslide.
Bag was the only one I owned as a kid, in college, when I lived 250 days a year in a wall tent doing forestry/logging for 15 years and many days hunting every year after that.
That bag has seen a whole ton of miles and outlived many a vehicle, and unfortunately a couple of hunting partners as well.
Almost got a lot blood on it though when a buddy asked what I was taking hunting one day and I said "just my hunting gear and the old bag". Little did I know my wife was standing directly behind me and didn't know I was referring to the Slumberjack, and not her! (Hell, I didn't even invite her on that trip.)