Antelope MF

I have the Western Mountaineering Antelope. I love it and would highly recommend it if it is in your budget. I did not get the overfill and have not had a problem with the fill compressing so if I was going to get a new one, I don't think I'd get the overfill. I am a slide sleeper that roles around and the bag conforms around me nicely (I actually find it better then my warm-weather quilt that I some how mange to tangle myself up).

If you don’t want to buy a bag for 10 years, get the Antelope. You’ll pass it down to your grandchildren. I have one from the late 90’s that’s my favorite thing ever, and a newer one that is the best winter bag I’ve ever tried by a good margin. High quality, warmer than its rating, excellent craftsmanship and details, the Antelope is the move. You won’t regret it. For overfill, you should be good for temperatures you’ll see, and WM down is very high quality and you won’t lose much loft at all, so it’ll just be extra weight. You can always add it later

The #3 zipper thing is legit - had one snag so much on a trip I almost ripped the baffle, defintiely go with the #5 YKK on the WM if you're keeping it for a decade.

If you want the best, the answer is Western Mountaineering. The antelope 5 is absolutely amazing for low temps. I’ve been inside sweating in 0* weather. True comfort rating not survivable temps. When it comes to other brands, I’d be looking at feathered friends, Nemo, mountain hardware, marmot. If you are experienced with quilts, that is another option.

The correct answer. Don't forget the overfill option, well worth it. Feathered Friends is also a good company, but I can not disagree with free hop. -40F Bison would be a fine choice, I have a WM -5F and I am very happy with it. I like putting a reflective mat does as my first layer of insulation against the cold ground.

I liked my quilt when I was doing shorter trips. Once I started doing months at a time I grabbed a western mountaineering bag and I have no regrets. Helps me extend a bit more into shoulder season

Western Mountaineering mummy bag. I do a lot in shoulder season and these are very warm for the weight

Western Mountaineering, Feathered Friends or Marmot for bags. Enlightened Equipment, Hammock Gear or Katabatic for backpacking quilts. Not cheap but quality and comfortable.