Kodiak MF

Late to the Party, but the Mountain Hardwear Phantom bags are no longer a good value proposition (not to imply that they were before), but you can get a Western Mountaineering Kodiak MF (Microfiber) for $850 or the Storm Shield Version for $985. The Phantom Windstopper 0 degree starts at $1,100. Western Mountaineering is made in the US and so some of the tariff-related inflation is not hitting them as hard, making them a better value proposition. Not to mention Western Mountaineering makes the best down products in the world. Other folks have mentioned Gryphon Gear. Another awesome option. You may need to wait a while to get one though. Feathered friends is great too but I think Western Mountaineering is amazing. My recommendation, Get a Kodiak MF. The Microfiber fabric may look unassuming at first, but it is incredibly durable, tightly-woven fabric with excellent weather/water resistance and it breathes super well, critical for multi-day winter outings. I have a Puma Storm Shield and while I love the fabric and the fortress feel, a laminate fabric like that takes a long time to pack into a stuff sack. It just traps air like a balloon. The microfiber is a dream fabric. A proper microfiber fabric where the filament count is equal to or higher than the denier of the fabric.

Late to the Party, but the Mountain Hardwear Phantom bags are no longer a good value proposition (not to imply that they were before), but you can get a Western Mountaineering Kodiak MF (Microfiber) for $850 or the Storm Shield Version for $985. The Phantom Windstopper 0 degree starts at $1,100. Western Mountaineering is made in the US and so some of the tariff-related inflation is not hitting them as hard, making them a better value proposition. Not to mention Western Mountaineering makes the best down products in the world. Other folks have mentioned Gryphon Gear. Another awesome option. You may need to wait a while to get one though. Feathered friends is great too but I think Western Mountaineering is amazing. My recommendation, Get a Kodiak MF. The Microfiber fabric may look unassuming at first, but it is incredibly durable, tightly-woven fabric with excellent weather/water resistance and it breathes super well, critical for multi-day winter outings. I have a Puma Storm Shield and while I love the fabric and the fortress feel, a laminate fabric like that takes a long time to pack into a stuff sack. It just traps air like a balloon. The microfiber is a dream fabric. A proper microfiber fabric where the filament count is equal to or higher than the denier of the fabric.

Western Mountaineering makes 6'6 bags in -25, -30, and -40 ratings. Their Kodiak rated to 0°F goes to 7'0, and you can order bags 'overfilled' - with more down than normal so call it an additional 5 degrees.

FWIW they are above & beyond others, have a lot of loft, and have great resale value. You can find used ones relatively frequently, commonly from mountaineering groups.

0° western mountaineering bag. I sleep cold if I don't sleep my trips suck. I've tried every other way. Since I plan on being a lifetime backpacker and doing it until I can't walk anymore, I figured this was worth the investment. I don't buy a lot of gear and take care of what I do have to make it last as long as possible

I call my WM my "magic bag," never been cold in it.

I am a cold sleeper too. And I’m embarrassed to admit, I could afford a western mountaineering bag. It was 0°. And I’m 59 and I got the 6 foot six version. Giving me tons of down to snuggle into. I actually use this bag way more than just the winter and I’m always toasty warm.

Western mountaineering. I get cold easily even in the summer in Colorado at high altitudes. I also snow camp

Don’t forget to get a really big bag one that goes way over your head. It’s just so cozy.

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.