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Cold Weather Synthetic Sleeping Bags

The best cold weather synthetic sleeping bags, reviewed and curated by the Trailspace community. The latest review was added on July 18, 2021. Stores' prices and availability are updated daily.

Recent Cold Weather Synthetic Sleeping Bag Reviews

rated 4 of 5 stars
U.S. Military MSS (Modular Sleep System) Patrol

I have the Patrol bag from the MSS. Nice outer bag with top grade mil spec materials. Grabbed it on sale for $50 CAD. Have seen the system with Bivy bag and Intermediate bag for reasonable dollars. Looking forward to some early fall deer hunting camp. Always understood that military specifications were standards that were rigorous and that gear approved for our nation's forces was made to hold up to hard use and give years of service. Good enough for the military, then that is good enough for me. Full review

rated 5 of 5 stars
U.S. Military MSS (Modular Sleep System)

I like this sleep system. Full review

rated 5 of 5 stars
Wiggy's Super Light FTRSS

-4 degrees and as comfortable as could be. When you are outside in the cold and you know that everything is going to be OK, that's how I would describe this bag! This is the kind of bag you just can't wait to get into. Very warm (after about 15 seconds, then it warms right up). At -4 degrees it does everything I expect it to do. I'm a warm sleeper and most of the time it's unzipped. Packs great and puffs right up when you are ready to sleep. The bag is perfect for what I do, very durable heavy… Full review

rated 5 of 5 stars
U.S. Military MSS (Modular Sleep System)

It comes in three to four parts, where you can sleep in one part, two parts, three parts or four. I have slept in it all together and I had to open it up sometime during the night because I had gotten too warm. Come to find out it had gotten below freezing that night. I have also slept in just one part, the temp was at around 100° to 110° that night. Although it was hot, I was comfortable. Compresses down to about the size of a basketball, although it could probably compress smaller. Three to… Full review

rated 4 of 5 stars
U.S. Military MSS (Modular Sleep System)

Great first sleeping system (with two pads). Horrible for backpacking. I recommend the MSS to all my Boy Scouts. A used MSS paired with two foam pads is BY FAR the best value in sleeping gear. Here's what I give all my new Scouts (and parents): A synthetic-fill sleeping bag and two dimpled foam pads are best for most Scouts. Both are cheaper, rugged, easier to wash, and handle wet/dirty conditions better. Both can be used with better and/or cold-weather gear you can buy later. Consider first the… Full review

rated 3.5 of 5 stars
Wiggy's Ultima Thule

For the price, this is a good bag, well-sewn and durable. It is roomy and comfortable and a pleasure to crawl into. I have an issue with my bag at temps under zero that I was surprised to find. The seam that is opposite the zipper side that runs from head to toe is very thin. Less than 1/4 inch of insulation can be felt along that seam. At 8 degrees below zero Fahrenheit, I experience a cold streak along this side of my bag. As mentioned above, overall for the price I am happy to keep and use this… Full review

rated 2.5 of 5 stars
Slumberjack Latitude -20°F

OK winter outer bag, as long as you know how to sleep and survive in cold weather. Too big for a standalone bag for me. I used this bag last winter in northern MN while leading dogsledding/skiing trips as an outer bag combined with an old 15 or 20 degree down inner (probably actually 20-25° now) and spent around 40 nights out in it, in temps ranging from -25°F to 30°F. Slept on two Therm-a-Rest RidgeRests under open tarps, in a mid, or in a doglsed. As others have noted, probably not wise to… Full review

rated 5 of 5 stars
Slumberjack Latitude -20°F

Bag lives up to its name. People who contest otherwise are not dressing appropriately (overdressing) and should find other activities than outdoor ones. This bag keeps you warm. Some writers have indicated that it is overrated. ALL bags are rated for ideal conditions and are thus overrated for some activities. ALL. Bag is comfortable, loft holds up well. NOTE: you cannot overdress and use a bag that is designed for this low of a temperature. The more you wear, the more you will actually sweat. Sweat… Full review

rated 4 of 5 stars
The North Face Dark Star -40

If you are crazy enough to winter camp in northern Minnesota (or most places in Canada for that matter) and want an affordable extreme cold-weather bag, this one should be high on your list. Look folks, -40 degrees is cold. I mean COLD. Few of us will ever get to experience it. I came close, though. During a week-long winter camping trip to the BWCA in northern Minnesota the night temps fell to -30°F, and probably a few degrees colder. Our group had two cotton tents, neither heated at night, and… Full review