Updated on January 9, 2024

Chilly weather shouldn’t keep you from getting outside, but when you’re camping in the cold, you need a sleeping bag that will keep you from freezing. A 0 degree sleeping bag is a great choice for camping in a variety of seasons, but how do you choose the right one to warm you up? Here at The Adventure Junkies, we’ve sorted through a variety of options to help you choose one of the best 0 degree sleeping bags to keep you cozy on your cold adventures.

For a complete analysis of all backpacking sleeping bags, check out the buyer’s guide Best Backpacking Sleeping Bags.


Quick Answer - The Best 0 Degree Sleeping Bags

  1. Western Mountaineering Kodiak MF
  2. Marmot Trestles 0
  3. Kelty Cosmic Down 0
  4. Marmot Never Summer
  5. Sea to Summit Ascent AcIII


Comparison Table - Best 0 Degree Sleeping Bags

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Western Mountaineering Kodiak MFDown2.7 lbsMummy$7504.7Read Review
Marmot Trestles 0Synthetic4.6 lbsMummy$1994.6Read Review
Kelty Cosmic Down 0Down4.5 lbsMummy$3004.3Read Review
Marmot Never SummerDown3.1 lbsMummy$3004.4Read Review
Sea to Summit Ascent AcIIIDown2.9 lbsSemi-rectangular$4694.7Read Review

Weight and price are shown for the regular size.

Want to learn more about a technical term? Check out our Features Explained section below.

Need buying advice? Take a look at these Things to Consider.

Reviews - Best Backpacking 0 Degree Sleeping Bags

Western Mountaineering Kodiak MF

  • Fill Weight: 30.0 oz
  • Insulation: Down
  • Weight: 2.7 lbs
  • Shape: Mummy
  • Volume: 14.4 L
  • Temp Rating: 0 F
  • Fill Power: 850
  • Very comfortable
  • Full Down Collar
  • Spacing/Continuous Baffles
Western Mountaineering Kodiak MF Backpacking Sleeping Bag


The Western Mountaineering Kodiak MF is a four season sleeping bag that was designed for backpackers who want to brave extreme conditions in comfort. 

While there are plenty of excellent winter sleeping bags out there, the Kodiak MF is our top choice because it is seriously warm and comfortable. While other bags are equally as toasty, they have a narrower fit that makes them constricting. When it is cold out, we tend to spend more time inside our bags and appreciate the extra room. The Kodiak MF adds a few inches in the shoulders and is generously packed with down making it super lofty. The spaciousness also gives you the option to stuff in an extra quilt if you need to add some warmth. Considering how warm this bag is, it packs down incredibly well. 

If you’re just getting into backpacking the price tag might seem ridiculous but for serious backpackers who value high end gear, it’s a worthy investment. Also, like with all proper winter sleeping bags, the versatility of the Kodiak is limited. It would be way too warm for summer backpacking trips and overkill in mild Spring weather.

The Kodiak MF is also available in a 6 foot and 7 foot version.

Marmot Trestles 0

  • Insulation: Synthetic
  • Weight: 4.6 lbs
  • Shape: Mummy
  • Temp Rating: 15 F
  • Shell: Polyester
  • Stuff Sack Size: 9.5 x 21 Inches
  • Zipper Location: Left
  • Fitted Hood Provides Warmth
  • External Stash Pocket Stores Your Valuables
  • Zipper Guard Prevents Bag From Snagging While Zipping And Unzipping
  • Vaulted Footbox Provides Warmth

The Marmot Trestles 0 sleeping bag is a great option for someone looking for a bag that will keep them warm in frigid temperatures, but doesn’t want to break the bank to invest in an expensive cold weather bag.

This bag is rated to keep you warm in temperatures down to 0°F, so it’s a great bag to take with you to the Cascades in Washington or the Sierra Nevadas in California. The bag itself will keep you toasty and cozy and the hood of the bag will provide extra heat for you.

This bag is made with quality material, including a zipper guard to make sure it won’t snag on your bag when you’re zipping it up. A 3D foodbox at the bottom provides warmth, and will also keep you comfortable by providing enough space at your feet so you won’t feel like you’re sardined into a bag.

This bag is a bit heavy, with the regular size weighing in at about 4 ½ lbs, but it sells at a killer price point. It can be hard to find a reliable backpacking sleeping bag for under $150 and, which is why this is a great option for hikers on a budget.

Kelty Cosmic Down 0

  • Gender: Men's
  • Insulation: Down
  • Weight: 4.5 lbs
  • Shape: Mummy
  • Temp Rating: 2 Degrees F
  • Insulation Type: Down
  • Soft Yet Durable Nylon Shell
  • Dual-Sliding Locking Zipper
  • Hand Pocket For Storing Overnight Essentials

If you’re on a budget and looking for a highly affordable, cold-bearing sleeping bag, then definitely consider the Kelty Cosmic 0. This bag, although ringing in at a lower cost, will keep you warm down to 2 Degrees Fahrenheit and it comes equipped with all the features you need for a good night’s rest. A draft collar ensures warmth around the neck while the water repellent coating easily wicks away moisture. 

Pack this bag if you’re thinking about a quick, cold weather expedition. You probably won’t want to rely on this bag for long duration expeditions, where you may be spending a lot of time in your tent, but if a quick in-and-out journey is on the docket, then definitely consider saving yourself some money and going with the Kelty Cosmic 0.

Marmot Never Summer

  • Type: Mummy
  • Material: Nylon
  • Fill Weight: 31.7 oz
  • Insulation: Down
  • Weight: 3.1 lbs
  • Shape: Mummy
  • Volume: 16.8 L
  • Water Resistant: Yes
  • Temp Rating: 12 F
  • Fill Power: 650
  • Water-resistant Finish Protects The Down And Shell
  • Insulated Collar, Hood, And Draft Tube Allow You To Breathe Without Losing Heat
  • Internal Pocket Keeps Your Phone And Flashlight Within Reach
  • Generous Foot Room With Foot Warmer Pockets Keep Your Toes Toasty
  • Comes With A Stuff Sack And Storage Bag For Packing
Marmot Never Summer

If hiking is in your bones, your love of the sport doesn’t magically end in the winter. Well, thankfully sporting goods manufacturers see your obsession and raise you the gear to match it. The Marmot Never Summer, for example, voids the idea of “stepping out of your comfort zone” with your very own comfort zone. 

The sleeping bag makes you feel more like you’re sitting on a rug in front of the fireplace than resting in sub-freezing temperatures. Your entire head will be covered by the hood of this bag and you can even put heating packs in the foot pockets, because it’s impossible to fall asleep with cold feet. Plus, it’s a lot easier to face tomorrow’s summit after getting a good night’s rest tonight.

Sea to Summit Ascent AcIII

  • Insulation: Down
  • Weight: 2.9 lbs
  • Shape: Semi-rectangular
  • Zipper Location: Left
  • Semi-rectangular Shape Gives You More Hip Room Than Mummy Shape
  • Additional Half Zip On One Side Offers Extra Ventilation
  • Can Unzip Completely To Use As A Quilt

With zippers galore for a variety of configurations, the Sea to Summit Ascent ACIII is a 0 degree sleeping bag that you can zip together with another bag or unzip completely to lay flat as a warm winter quilt. You can also unzip one side like a standard sleeping bag, half unzip the top layer if you need extra ventilation, or unzip just the foot-box if your feet start to sweat.

The Sea to Summit Ascent ACIII is designed with vertical baffles on the torso, which keep the insulation in place inside the bag and prevents cold spots. The semi-rectangular shape also provides a bit more room than a mummy-style bag, so you can sleep comfortably.




Although temperature ratings of sleeping bags are standardized, it can still be confusing to understand in what conditions a 0 degree sleeping bag will keep you warm. Your entire sleeping setup (clothing, sleeping pad, tent) can affect how warm and comfortable you’ll actually feel at night, and, of course, each person’s body regulates temperature a little differently. REI put together a guide explaining how sleeping bag temperature ratings work.



Down fill power differs between 0 degree sleeping bags and makes a difference in both weight and warmth. But what exactly does it mean? Basically, it describes the quality of the down. A higher number provides better insulation (but is not necessarily warmer) and is usually much more expensive. This article from REI goes into more detail about down fill power.



Many 0 degree sleeping bags are mummy-shaped, which means they fit tight to the body. This offers extra warmth while also cutting weight since it eliminates extra fabric and insulation. However, mummy bags can feel quite restrictive since you don’t have much room to move.

Semi-rectangular bags give you a little more space so you’re more comfortable when you sleep. These bags might weigh slightly more, but if they are well-designed, they should still be able to keep you warm.



Most sleeping bags have full-length zippers on just one side, so if you have a preference due to your dominant hand or the side of your tent the door is on, try to choose a bag that won’t frustrate you with a zipper on the wrong side.

Many 0 degree sleeping bags also have a second partial zipper to give you extra ventilation. Some even have zippers at the feet or can unzip fully to lay flat if you need a blanket.





Fabric separators that keep down insulation in place.


Draft tube

A tube filled with insulation that backs the length of the zipper to block cold from entering.


Draft collar

An insulation-filled collar to provide extra warmth at the neck.