Open main menu

Cold Weather Sleeping Bags

Types of Cold Weather Sleeping Bags (below 0°F)

photo of a cold weather down sleeping bag

Cold Weather Down Sleeping Bags

photo of a cold weather synthetic sleeping bag

Cold Weather Synthetic Sleeping Bags

Top Picks

How we choose: The best cold weather sleeping bags highlighted here were selected based on 345 reviews of 153 products. Our top picks are those that are readily-available in the United States and have received the highest overall ratings from reviewers.

How we test: Trailspace is powered entirely by our community of readers. The reviews posted here reflect the real-world experiences of outdoor enthusiasts just like you.

If you've used a cold weather sleeping bag that you think should be listed here, please share your experience.

Disclosure: Trailspace never accepts payment for gear reviews, product placement, or editorial coverage. When you buy through affiliate links on our site, Trailspace may earn a small commission, which helps cover the costs of running the site.

Top Cold Weather Down Sleeping Bag

Marmot Col MemBrain

user rating: 5 of 5 (1 review)

Embrace the caterpillar in you!

Reasons to Buy

  • Warm
  • Shoulder baffles keep inside from getting damp

Reasons to Avoid

  • Still large-ish when packed

With this bag, I feel and look like a squashy green caterpillar. Zip it up, snuggle down, and after the coziest sleep in the coldest temps, you'll emerge in the morning a beautiful butterfly. That is if you can bear to come out! I'm a 5'4" smaller woman. I sleep cold and this bag works well for me in even the coldest of temps. I've still paired it with a liner for truly -20°F temps and that works well in a four-season tent.  Zipping all the way up can be a slight challenge—it's a bit of a squeeze, but comfy once enclosed.

Read more: Marmot Col MemBrain review (1)

Cold Weather Down Sleeping Bag

Warmlite Triple Bag

user rating: 5 of 5 (4 reviews)

Stephenson's Warmlite Triple bag is a top notch camping and backpacking sleep “system.” While an old design, it is still unique in the market, has a wonderfully comfortable mattress, and covers an extremely wide temperature range due to the dual tops design, for a price that is very attractive if you consider the alternatives.

Reasons to Buy

  • High end 850+ down
  • Dual tops
  • Wide temperature range -60°F to +50°F (maybe +60°F)
  • Super comfy built-in mattress
  • Lightweight system overall
  • Available in four standard and any custom size or color
  • American made!!!
  • Bargain compared to competition

Reasons to Avoid

  • Somewhat finicky mattress valve
  • Takes effort and practice to inflate mattress

After many years, it was time to upgrade to a new sleeping bag and pad. One of my sons decided to “confiscate” my old cold weather sleeping bag and cold weather pad, so I took the opportunity to research and buy a new system. After 20 years, the old one was well loved anyway. I had a few prerequisites, which were as follows: Not mummy shape, but more of a square taper or modified taper shape. I’d grown to not like the restrictions of a tight mummy bag over the years and have really never found them comfortable.

Read more: Warmlite Triple Bag reviews (4)

Cold Weather Down Sleeping Bag

Western Mountaineering Bison GWS

user rating: 5 of 5 (3 reviews)

Incredible quality in materials and craftsmanship. Packs down very small and is very lightweight (under 5 lbs) for its temp rating of -40F. I have no doubt it will live up to its reputation when put to the test.

Reasons to Buy

  • Lightweight
  • Excellent materials and craftsmanship
  • A WIDE mummy bag
  • Made in the USA

***FEB. 3, 2015 UPDATE after field testing the Western Mountaineering Bison GWS****** So last night the temps got down to 23F here in Atlanta, so I set up my tent in the back yard and slept in the WM Bison GWS. WOW!!!  AWESOME BAG!!!! I have added a few photos to show the loft of the bag using a wine bottle for scale and using my hand for scale at the end of the foot box.  Anyway, the bag was super comfy as I expected, and I was able to sleep on my right and left sides and the bag did not turn with me which is what I wanted.

Read more: Western Mountaineering Bison GWS reviews (3)

Cold Weather Down Sleeping Bag

The North Face Inferno -40F/-40C

user rating: 5 of 5 (6 reviews)

Reasons to Buy

  • 700 fill power
  • Versatec shell
  • About 12 inches of loft
  • 25 years and still going strong

Reasons to Avoid

  • None.

I purchased this bag back in the mid 1980s when it first came out. It still has the old brown label on it and a Versatec shell. Back then the North Face worker who made it used to sign their name on the product label. The label is intact but the name has long since faded and I forgot it long ago. Over the years I have used it on all my winter expeditions to the Arctic and it has never failed me. It is as good, as warm, and as lofty as any winter bag out there. After more than 20 years of hard use, sometimes sleeping in it for an entire winter, it has served me well and is still just as good as the day I bought it, with the exception of a few minor holes.

Read more: The North Face Inferno -40F/-40C reviews (6)

Top Cold Weather Synthetic Sleeping Bag

U.S. Military MSS (Modular Sleep System)

user rating: 4.5 of 5 (9 reviews)

I bought the MSS Sleep System from Smith's Surplus and it's brilliantly adaptable for any environment. Made with high-quality materials, it's durable, and features a waterproof layer that blocks wind and water. With two sleeping bags of different sizes, it caters to different weather conditions, keeping you toasty even below freezing. Its versatile, modular design makes it a cost-effective and practical choice.

Reasons to Buy

  • High-Quality Materials: Ensures durability and reliability in various environmental conditions.
  • Modular Design: Offers adaptability by allowing you to use parts of the system as needed, fitting different climates and situations.
  • Excellent Protection: The bivy provides outstanding shelter, keeping you dry and comfortable even in wet or windy conditions.

Reasons to Avoid

  • Bulkiness: The intermediate bag, essential for colder weather, is larger and heavier, making it less convenient for light travel.
  • Not the Latest Technology: It's not the newest or lightest option available, which might be a drawback for those seeking the latest advancements in sleeping systems.
  • Temperature Flexibility: While excellent for extreme cold, the system's warmth might be overkill in milder weather, limiting its use in warmer climates without the need for such high insulation levels.

I bought the MSS Sleep System at Smith’s Surplus and I have to tell you, it's the only sleeping system I ever need. It's adaptable, meaning you can use it in any setting. What makes it stand out is the high-quality materials and construction. It's built to last. The "bivy", or the outer layer, is amazing. It once kept me completely dry, even when I woke up in the middle of a stream. It prevents wind and water from getting in. The patrol bag, one component of the system, is light and small, but still super warm.

Read more: U.S. Military MSS (Modular Sleep System) reviews (9)

Cold Weather Down Sleeping Bag

Valandré Thor

user rating: 5 of 5 (5 reviews)

This is not a full review, but more some random notes for potential buyers. I feel there's not too much info out there about this bag. I haven't given this bag a rating since I haven't used it yet, but wanted to write this before forgetting.

Reasons to Buy

  • Weighs 4lb 11oz without compressor bag

Reasons to Avoid

  • Compression sac is worthless
  • Downs are not hydrophobic

I have a Big Agnes -20F (-29C) that I've been happy with. It doesn't have down on the bottom side, but you're suppose to use it with an air sleeping pad that you insert into the bottom part of the sleeping bag. This has been working fine. It's very light but I've been suffering from cold spots from below and the BA's lower limit is definitely only -20°F. That is why I've been looking for a warmer bag. Looking for a new bag has been something I've given a lot of thought since my only experience is from my Big Agnes.

Read more: Valandré Thor reviews (5)

Cold Weather Down Sleeping Bag

Mountain Hardwear Ghost SL -40

user rating: 5 of 5 (2 reviews)

One of the warmest bags in the world — from a world class manufacturer — and made with high quality fabrics and well crafted. This extreme weather /survival sleeping-bag rated is rated to Minus Forty Degree's (-40F/-40C) and even if not used in those temperatures, it can make for a comfortable nights sleep especially for those that sleep cold or need to warm up quickly as soon as they get in their sleeping bags. This is a perfect product for high altitude mountaineering, polar and artic expeditions and here is my review, hope it helps!

Reasons to Buy

  • One of the warmest sleeping bags on market
  • High quality construction, attention to detail
  • Compresses well due to high loft 800 fill down
  • For high altitude mountaineering, polar and artic extremes
  • Expedition ready for high alttitude or extreme weather
  • Waterproof outfabric
  • Tough and durable
  • Great for cold sleepers even in warmer tempertures.

Reasons to Avoid

  • Relatively heavy and takes up alot of space
  • expensive
  • Overkill, unless it's really cold out (at least -5°F or lower)
  • You will sweat in this bag if it's not that cold out (35-45°F)

OVERVIEW This is a very roomy sleeping bag and has numerous pockets inside for cell phone, watch, earplugs or other small personal items (ipod, snack,etc..). There are very generous amounts of high quality 800 fill down throughout this bag and evenly spaced in all areas including around the head and feet and everywhere in between. The zipper, although it might snag sometimes, is very durable and has a protective flap on the outside which can help shed snow or rain/water and on the inside part of the entire length of the zipper there is a long tube of down constructed as to make up the empty space where the zipper closes both side of the  bag together.

Read more: Mountain Hardwear Ghost SL -40 reviews (2)

Cold Weather Synthetic Sleeping Bag

Wiggy's Super Light FTRSS

user rating: 4.5 of 5 (9 reviews)

Just found this site, looking for Wiggy's site. I was amazed to read some of the other stories in regard to their experience with Wiggy's. I have no reason to doubt either side in that, I can only relate my own experience.I ordered a number of bags from a Wiggy's dealer in 1999. They were drop shipped to me directly from Wiggy's, and arrived in large cardboard boxes. I ordered bags for myself and girlfriend, and three relatives at the same time, as well as the lamilite ground pads. I'm sure I made my dealer's day, that day.I can only relate firsthand experience for the Superlight FTRSS product (though all bags are still in use at this time).

Read more: Wiggy's Super Light FTRSS reviews (9)

Cold Weather Down Sleeping Bag

Western Mountaineering Puma GWS

user rating: 5 of 5 (3 reviews)

If you're not willing to compromise, this is the bag to get. True to its temperature rating, and the GWS shell keeps moisture out while allowing enough breathability to dry out some damp clothing at night.

Reasons to Buy

  • Packability
  • Durability
  • Warmth

Reasons to Avoid

  • Takes some time to get stuffed down to size

Winter camping with this bag down to about -15°F and I've not had any issues with warmth while wearing silk long underwear. The loft is amazing and pops right up after unpacking. I'm 5'11" and went with the 6' bag; I still have room to fit boot liners and clothing in the bag if necessary, and while I usually sleep on my back, I have no problem side sleeping either. The hood protects well and is comfortable, although I'd be interested to see how I like it compared to some of the Feathered Friends hood designs.

Read more: Western Mountaineering Puma GWS reviews (3)

Cold Weather Synthetic Sleeping Bag

Wiggy's Antarctic

user rating: 5 of 5 (3 reviews)

No frill military grade bag — no frills — just a lot of material to keep you warm the ultimate intent.

Reasons to Buy

  • Durability
  • Simplicity

Reasons to Avoid

  • Absent of back-up closure like snaps or velcro
  • Bag has nothing to keep the baffle down like velcro so there are cold spots

This bag is no frills — it is simple and durable and can not be beat. In other words, it isn't a Cadillac — it's a 1 ton work truck. When you get the bag, take it to a seamstress and have them blind stitch velcro on the inside IOT keep the baffle down over the zipper and also install a durable fabric strip with snaps on the outside of the zipper IOT provide an extra margin of safety. After all this bag is intended to save your life. Wiggy's doesn't need to do the aforementioned because of the different styles out there and by them not doing them keeps the cost of the bag down.

Read more: Wiggy's Antarctic reviews (3)

More Cold Weather Sleeping Bags

Trailspace reviewers have shared 345 reviews of 153 different cold weather sleeping bags. Narrow your search and view more specific cold weather sleeping bag recommendations in these categories:

Cold Weather Down Sleeping Bags

Cold Weather Synthetic Sleeping Bags

All Sleeping Bags and Pads

Other Types of Sleeping Bags and Pads

Find more sleeping bags and pads reviewed in these related categories:

3-Season Sleeping Bags (0° to 32°F)

Warm Weather Sleeping Bags (above 35°F)


+4 more types

Review Your Outdoor Gear

If you've found this site helpful — or if we've missed something important — please consider paying it forward by some of your favorite outdoor gear.

Why? From professional gearheads to outdoor novices, everyone has an important point of view to contribute. will support the outdoor community and help others find the best gear.

Trailspace reviewers are outdoor enthusiasts like you: hikers, climbers, paddlers, backcountry skiers, and trail runners who share our experiences with the gear and clothing we rely on to get outside. Learn more about Trailspace