The Best Cold Weather Sleeping Bag – Reviews 2021

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Best Cold Weather Sleeping bag

You’ve done it! You scaled the mountain, you trekked until your legs wanted to fall off, you’ve filtered water, stewed your dinner over an open fire by moonlight, crawled into your tent at the end of a long day in the wilderness, and what happens?

An unexpected temperature drop leaves you awake, cold, and shivering into a sleepless night while praying for the sun to rise. That’s why you will want the best cold weather sleeping bag that exists.

If you’re an experienced hiker, you know the danger and sheer torture of a night like that, and, as such, know that a solid cold weather sleeping bag is a nonnegotiable on the trail. That’s why the Klymit KSB 20 Down Sleeping Bag is a must for your cold weather hiking arsenal!

Tough on the Tundra

This gear of the year pick is built to last in even the coldest conditions, we’re talking near tundra cold. The Klymit KSB 20 was designed to keep you warm and cozy well past freezing right down to 20 degrees Fahrenheit. Ever been in outside when it’s close to 20 degrees? Pretty cold right? Imagine trying to sleep in it!

The Klymit KSB will have you snoozing away dreaming of conquering the next summit regardless of the frigid temperatures outside!

Confident in Comfort

Good rest leads to great energy, and great energy leads to terrific hiking! As such, you shouldn’t take your sleeping time lightly, it actually could be one of the most important things you invest in on the trail.

Maximize your sleep by ensuring comfort with the Klymit KSB 20. This bag was designed to bend and flex with all body types. It’s elastic yet soft making it ideal for sleeping soundly while retaining your ability to move around a bit. No one wants to sleep rigid as a board, and with the Klymit you won’t have to.

Lighten Up

Unfortunately, your sleeping bag will be one of the heavier items in your pack, but even with this being the general state of things, that doesn’t mean you have to opt for carrying the equivalent to a five pound portable heater in your pack. The Klymit KSB 20 is a strategic choice for a reliably warm bag that won’t break your wallet or your base weight goals for your pack.

This sleeping bag weighs in at around 2.5 pounds, which granted isn’t the lightest bag on the market, but it is far from the heaviest. This cold weather sleeping bag weighs in just right to fit the ideal ultralight or general wilderness backpacker’s expectations.

Features and Specifications

  • The Klymit KSB 20 features Flexible Baffles, allowing you to have room to move while still staying warm.
  • An inner stash pocket within the lining of the bag gives you a handy location to store items you’d want easy access to (phone, money, flashlight).
  • The Klymit is all about cooperation. It utilizes a foot box, draft collar, and mummy hood to utilize your core temperature to your favor and keep you warm all night long.
  • As mentioned, the Klymit KSB is ultralight friendly and weighs in at around 2.5 pounds!
  • The Klymit KSB 20 was designed to withstand the rugged conditions expected on the trail. Its 20D rip-stop nylon give it keeps it strong and reliable while helping it maintain it’s lightweight advantage.
  • A little short? Don’t fret! The Klymit KSB 20 comes equipped with an adjustable strap to reduce the length by up to 15 inches to suit a wide range of body types!


What Customers are Saying

Most customers can’t help but mention how reliable the Klymit KSB Down 20 was in keeping them warm while not breaking their budget. However, the sleeping bag’s weight is what consistently sticks out to us hikers. You can’t find a better buy in terms of something reliable and pristine that will still help you in keeping your pack light.

Granted, some buyers have mentioned a slight dissatisfaction when it comes to the Klymit KSB’s duck down fill not quite giving the bag the full feeling they were hoping for. However, in the long run this may be an expectation better put aside as a lighter fill just allows the bag to compress all the better leaving even more room in our back for candy bars!

The versatility and weight of this pack are more than enough for me to recommend it to any hardy hiker.


Who Should Buy this Product?

Does your wanderlust sweep your feet out the door and onto the trail regardless of the season? This bag is for the hiker that doesn’t want to put their adventuring on hold just because the thermometer has dropped a little bit. The hiker who wants to stay warm, while staying light and nimble, will benefit greatly from the Klymit KSB 20.


Who Shouldn’t Buy this Product?

Great cold weather sleeping bags like the Klymit KSB are made for just that, cold weather. Your average joe weekend hiker trekking the scorching canyons of Arizona in the height of the summer might find the Klymit KSB a bit of an overkill for his given conditions.

For those who just opt to stay indoors when the temperature drops might want to opt for the a blanket and a nice book instead of a cold weather sleeping bag.



The Klymit KSB Down 20 is the state of the art pick for the most adventurous of us who won’t let cold weather get in our way of a great hike and great night’s sleep on the trail. Stay warm, light, and flexible by gearing up with the Klymit KSB 20! We consider this oen to be the best cold weather sleeping bag.


Are you a side sleeper? Read about our top sleeping pad for side sleepers here. 

Need a sleeping pad for your backpacking trip? We recommend this one here. 

Looking to carry a lighter load on your backpacking trip? Check out our ultra lightweight sleeping pad here. 

Meet the Author

'Mountain Man' John

'Mountain Man' John is a Survival and Preparedness enthusiast who loves everything outdoors. He has a passion for learning anything and everything to help sustain his and his families way of life post SHTF. He frequently shares his knowledge on a variety of topics from his hands on DIY projects, learning new skills such as hunting and trapping along with reviews on his Survival related purchases - Prepping has been in his family for generations, it's in his blood.