Cold Weather Synthetic Sleeping Bags

Recent Cold Weather Synthetic Sleeping Bag Reviews

U.S. Military MSS (Modular Sleep System)

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. I bought the MSS Sleep System at Smith’s Surplus and I have to tell you, it's the only… Full review

Wiggy's Super Light FTRSS

Good all around bags. Combined they're incredible. Easy to clean, pack, great kit. Being retired Military, I have used some incredibly crappy sleep systems.  Frankly, so bad it bordered on criminal to issue them to the troops.  But that's what we get. I discovered Wiggy's oddly enough by the boots he made. Lamilite insulated leather boots that were freaking amazing.  So I figured if those worked, well.................. I invested in the FTRSS system in the boat foot style bags. I've never looked… Full review

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

U.S. Military MSS (Modular Sleep System)

I like this sleep system. Full review

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

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

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

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

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