Best 0-Degree Sleeping Bags In 2021

If you are backpacking this winter or a camping enthusiast, a sleeping bag is necessary. After all, you need adequate rest for the next day, which is why you can't freeze in harsh temperatures. A high-quality sleeping bag will ensure you stay warm all night and get your rest. So, to everyone embarking on winter adventures soon, this guide is for you. Here are the top 8 best 0-degree sleeping bags in 2021 that will keep you warm no matter what.

Top 8 Best 0-Degree Sleeping Bags In 2021

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Best 0-Degree Sleeping Bags

Nemo Sonic 800 Fill-Down Sleeping Bag

 Drawstring closure

2. 800 FP Hydrophobic Down

3. 100% RDS Certified

Best 0-Degree Sleeping Bags

Big Agnes Sentinel 30


Flex pad sleeve 

Polyester rip-stop shell fabric

Best 0-Degree Sleeping Bags

Therm-A-Rest Questar

SynergyLink connectors

650 fill Nikwax Hydrophobic down

Left zip

Best 0-Degree Sleeping Bags

Marmot Never Summer Sleeping Bag

100% nylon

Wrap-around foot box 

Mummy shaped

Best 0-Degree Sleeping Bags

Kelty Cosmic 0 Degree Down Sleeping Bag

 DriDown insulation

Dual zippers

Trapezoidal baffle construction

Klymit KSB 0 Degree Sleeping Bag


Mummy hood with draft collar

650 power fill down

Hyke & Byke F 800 Hydrophobic Sleeping Bag

800 fill power insulation

Comes in three sizes

Water-resistant shell fabric

Teton Sports 101R

Compression sack

Fiber-fill double-layer construction


1. Best 0-Degree Sleeping Bags: Nemo Sonic 800 Fill-Down Sleeping Bag – Best Overall

Best 0-Degree Sleeping Bags

The Nemo Sonic is one of the top sleeping bags all backpackers opt for. The design is award-winning, which is why it is a favorite with campers, hikers, and mountaineers. The sleeping has adjustable thermo gills that vent body heat without allowing any cold air to come inside. 

The best part is that you can also sleep on your side as the sleeping bag has stretch construction at the knees. That is why it is one of the most comfortable bags that mountaineers love. There is a lot of place to space move around without compromising on insulation. 

The high-quality 800 fill-down power means that the bag is lightweight but highly insulated. So, while you are camping or hiking, you will not be brought down by the weight of this sleeping bag. However, your feet might feel less warm as the foot box is a little stretchy. 

Of course, it is still the best 0-degree sleeping bag because of its high-quality construction. If you love to be comfortable in freezing temperatures, then this sleeping bag is perfect for you.


  • The most comfortable 0-degree sleeping bag
  • Highly compressible
  • Lightweight shell fabric
  • Roomy hood
  • Well insulated


  • Expensive
  • Less insulation around the feet

2. Best 0-Degree Sleeping Bags: Big Agnes Sentinel 30 – Runner Up

Best 0-Degree Sleeping Bags

If you are camping or hiking with your friends or partner, this Big Agnes Sentinel 30 sleeping bag is ideal for you. The sleeping bag is double, which means you will get more space while sleeping to stay comfortable. For a 0 degree double sleeping bag, this model is the most affordable. 

However, if you are a beginner outdoor adventurer, this sleeping bag might not be for you. That is because you have to employ some tips and tricks to enjoying this bag down to its claimed temperature rating. If you don't know these tips, you might still feel cold sleeping in this bag. 

One of the most significant advantages of this best 0-degree sleeping bag is that it offers a roomy interior. There is vast space inside, which is why it is also perfect for bed hogs. The polyester taffeta lining fabric is also incredibly comfortable and cozy to sleep in. 

An issue you might face with this bag is compression. It comes with a drawstring sack, which might make it ineffective to compress.


  • Best budget-friendly double sleeping bag
  • Spacious
  • Perfect for experienced campers and hikers
  • Comfortable polyester lining
  • Durable


  • Not too compressible
  • Not ideal for beginners

3. Best 0-Degree Sleeping Bags: Therm-A-Rest Questar

Best 0-Degree Sleeping Bags

If you want a comfortable sleeping bag suitable for backpacking, you should not look further than the Therm-A-Rest Questar. It is the best 0-degree sleeping bag for people who like to sleep on their stomachs or sides. That is because it offers maximum comfort to the user without compromising on warmth. 

However, you might need to stuff your bag with some things before using them as there might be uninsulated space in between that might limit warmth. Once you do that, you will love the comfort and spaciousness it has to offer. The shoulder room is immense, which means you don’t have to sleep in a mummy position. 

The SynergyLink connectors are also ideal for active sleepers as they will keep you from rolling into the cold surface. These connectors are removable elastic straps that connect your sleeping bag to the pad. Because of these connectors, you will never have to worry about rolling off. 

An issue we noticed was that the storage sack is a little tiny. So, it is better to store the bag in another sack or more extensive storage space.


  • Highly spacious
  • Ideal for active sleeper
  • Perfect for people who sleep on the side or stomach
  • Incredibly comfortable
  • Extensive shoulder room


  • The storage sack is little
  • Might need to stuff the bag for added warmth

4. Best 0-Degree Sleeping Bags: Marmot Never Summer Sleeping Bag

Best 0-Degree Sleeping Bags

The Marmot Never Summer sleeping is the best 0-degree sleeping bag because it keeps you warm even if moisture accumulates in your tent. That is because the sleeping bag is manufactured using a water repellent 650 fill power insulation. Because of this, you will stay warm no matter how low the temperature drops. 

The sleeping bag comes in a mummy shape, so you can be completely covered without any uninsulated space. So, the heat will stay close to your body, and there will be no areas from where the cold air might come in. If you need an added boost of warmth, you can always use the foot box pocket to hold a foot or hand warmer packet. 

The Marmot sleeping bag comes with two zippers. The first one is to ensure that all warm air stays in and the cold air stays out. However, the second zipper offers you ventilation whenever you feel suffocated in the sleeping bag. 

The only issue with this bag is that it does not provide a draft collar. Besides that, it is slightly challenging to compress after use.


  • Comfortable and soft
  • Water-resistant down to offer protection from elements
  • Wide foot box
  • Incredibly loft
  • Double zipper


  • Bulky to compress
  • It doesn't have a draft collar

5. Best 0-Degree Sleeping Bags: Kelty Cosmic 0 Degree Down Sleeping Bag

Best 0-Degree Sleeping Bags

The Kelty Cosmic 0 Degree Down is the best 0-degree sleeping bag because it is affordable and will keep you warm on freezing nights. The full-length draft tube and draft will protect you from harsh and freezing winds at night. It also provides room for people who like to sleep on their sides. 

The sleeping bag is designed to retain heat, which is why you will be comfortable all night in 0-degree temperatures. The foot box is also narrow, which means even further heat for you in the sleeping. The shell of the sleeping bag is weather-resistant for added protection. 

The shoulder room is also extensive as you can sleep on your side without feeling uncomfortable. The sack is also enormous, and you can easily store this sleeping bag inside. Other bags offering the same features are costly, which is why the Kelty Cosmic 0 Degree is ideal for people on a budget. 

However, the bag is not for long trips because it is cumbersome. You will not easily carry it around anywhere you like. So, if you are going on an overnight or a few days camping trips, then this sleeping bag is ideal.


  • Spacious and comfortable
  • Full-length draft tube
  • Protection from weather elements
  • Affordable
  • Easy storage


  • A heavy sleeping bag
  • Only suitable for overnight short outdoor trips

If you want the best 0-degree sleeping bag that offers a lot of stretch, then don't look further than the Klymit KSB. The best part about this sleeping bag is its stretch baffle system, which includes horizontal sections sewn with elastic thread. Because of this, the bag is highly stretchable, and you can sleep in comfort. 

The foot box is also oversized, which means you can comfortably spread your feet and enjoy sleeping. You can quickly move around in this bag, and it will still stick close to your body to retain heat and keep you warm. The shell fabric is also breathable, which means you will not feel suffocated. 

Compression is not an issue with this sleeping bag as you can easily compress and store wherever you like. If you take care of this sleeping bag, it will last you a long time to come without compromising on your comfort. The bag is fluffy and offers the best comfort. 

However, the zipper can get caught sometimes, but it is an easy fix. Besides that, you can feel the string inside the hood when it is synched. Other than that, the sleeping bag is perfect for campers.


  • Highly stretchable
  • Easily compressible
  • Affordable
  • Offers maximum comfort
  • Easy to pack


  • You can feel the string in the hood
  • The zipper might get caught sometimes

Hyke & Byke F800 is the best 0-degree sleeping bag because it offers a premium quality goose-down filling. Because of this, the sleeping bag stays ultralight while providing you maximum insulation while sleeping. No cold air will reach you inside, and you can sleep in comfort. 

The sleeping bag also has a drawstring in the hood to allow you to stay warm while sitting around at night. Of course, one of the best features of this bag is the vertical baffles that will enable you to adjust the bag throughout your body. The shoulder space is enormous, and the foot box is narrow to ensure better insulation.


  • Premium quality goose down
  • Spacious shoulder area
  • Narrow foot box for better insulation
  • Affordable
  • Maximum insulation


  • The zipper might get caught sometimes
  • You might not be able to sleep on your sides or stomach

Finally, we have the Teton Sports 101R as the best 0-degree sleeping bag on our list. If you want a rectangular large sleeping bag that can fit in your car for camping, this is a perfect choice. The lining is soft, and it offers maximum comfort to the user. 

You can adjust the draft tube and the zipper to prevent cold air from coming into your bag. The bag uses a nylon taffeta shell fabric to stop cold drafts and ensure warmth. The best part is the stuff sack that can easily fit the sleeping bag without any issues.


  • It offers the best stuff sack
  • Soft and comfortable lining
  • Affordable
  • Durable
  • High-quality


  • The construction can use some improvement
  • It might not be ideal for extended camping trips

Final Words

That was your complete guide to the eight best 0-degree sleeping bags in 2021. If you love to go on outdoor trips during the winters, you need sleeping bags to keep you warm and comfortable. All these sleeping bags are designed for your comfort and warmth to ensure adequate rest. 

While all the sleeping bags on our list are the best, our top choice is the Nemo Sonic 800 Fill-Down Sleeping Bag. It offers many features for its price range and focuses on ensuring the warmth of the individual using it. The award-winning bag will retain heat while ensuring you have the space to move around and sleep comfortably. 

Of course, the best 0-degree sleeping bag for you will depend on your budget and preferences. So, choose the best from our list today.

You can also read: Top 5 Best Double Sleeping Bag in 2021

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