Updated on October 8, 2020

The sleeping bag. Your cozy refuge at the end of a long day on the trail. Fluffy and warm, yet packable and lightweight. Perhaps roomy if you like extra space. Or water resistant if the rains are coming. A quick search online will reveal dozens upon dozens of options. Just how are you supposed to wade through all the options and pick the perfect sleeping bag for you?

By reading this one article, that’s how. We’ve done the research for you and plucked ten of the very best 20 degree sleeping bags to keep you nice and warm in most hiking conditions. Simply read on and find the perfect match for your style and needs.

For more of our top backpacking gear recommendations, check out the Best Backpacking Sleeping Bags.


Quick Answer - The Best 20 Degree Sleeping Bags

  1. Marmot Phase 20
  2. The North Face The One
  3. Western Mountaineering UltraLite
  4. Western Mountaineering Alpinlite
  5. Marmot Trestles Elite Eco
  6. Kelty Cosmic
  7. Sea to Summit Flame FmIII
  8. Therm-a-Rest Hyperion
  9. NEMO Forte


Comparison Table - Best 20 Degree Sleeping Bag

Marmot Phase 20Down - 850 FillMen’s: 23.3oz, Women’s: 29oz$$$3.2
The North Face The OneSynthetic Outer Layer, 800-Fill Down Mid-Layer35oz to 60oz$$4.1
Western Mountaineering UltraLiteDown - 850 Fill28 To 31oz$$$$4.9
Western Mountaineering AlpinliteDown - 850 Fill33/31/29oz$$$$4.9
Marmot Trestles Elite EcoSyntheticMen’s: 39oz, Women’s: 43oz$4.2
Kelty CosmicDown 600-FillMen’s: 42.7/38.6/35.9 oz, Women’s One Size: 41.0 oz$4.5
Sea to Summit Flame FmIIIDown 850-Fill26.3/23.5oz$$$4.6
Therm-a-Rest HyperionDown 900-Fill22/20/19oz$$$4.8
NEMO ForteSynthetic StratofiberMen’s: 53/49oz, Women’s: 61/56 oz$$4.4
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 - The Best Sleeping Bags Rated 20 Degrees

Marmot Phase 20

View Women's Version
  • Material: Ripstop Nylon
  • Insulation: Down - 850 Fill
  • Length: Men’s: 6’6” Women’s: 6’0”
  • Weight: Men’s: 23.3oz, Women’s: 29oz
  • Compressed Volume: 6.45 Liters
  • Shoulder Girth: 60in
  • Internal Stash Pocket
  • Hood Drawcord
  • Down Defender Treatment To Improve Water Resistance


Let’s start our rundown of the best 20 degree sleeping bags with the Phase 20 from Marmot. The 850-fill power down insulation provides consistently good warmth for those chillier camping nights. The hood furthermore includes a very handy drawcord, allowing you to cinch it snugly around your head to lock in the heat. 

Marmot has also included an internal stash pocket to keep any items you need close at hand. For my part, I find it very useful to stash my phone at night if I’m listening to music and want to keep the cold air from draining the battery. The down defender treatment also helps keep any moisture from seeping in and wreaking havoc on your insulation. 

While Marmot has certainly produced a beautiful sleeping bag in the Phase 20, it seems they tripped themselves over the zipper. The most common drawback we’re seeing across the board is a small and weak zipper that perpetually snags. So keep this in mind, and remember to handle that zipper with care if you commit to this sleeping bag.

The North Face The One

  • Material: 20D Nylon
  • Insulation: Synthetic Outer Layer, 800-Fill Down Mid-Layer
  • Length: 85/78in
  • Weight: 35oz to 60oz
  • Compressed Volume: 17.5 to 9.1 Liters
  • Shoulder Girth: 63/61in
  • Modular Design Allows You To Adjust Insulation
  • Down Mid-Layer Unzips To Become Shawl Or Blanket
  • Excellent Price For Such Comprehensive Sleeping Comfort


Most of the grizzled hiking veterans out there have at least two sleeping bags, right? A light bag for warmer temps and a heavier one for the colder weather. Some folks will even have three or more bags! So how about a modular sleeping bag you can fine-tune to the temperature of your hiking adventures? Sounds amazing to us too, and that’s why The One Bag from The North Face made our list of the best 20 degree sleeping bags – even though it works for a range of temperatures. 

This bag comes with a synthetic outer layer that is rated to 40 degrees alone. Add in the down mid layer with the synthetic bottom for 20 degree temperatures. Or combine the down midlayer with the synthetic top and bottom for 5 degrees. All these layers do add more bulk than a strictly down sleeping bag, however. The complete system clocks in at well over 3lbs and only packs down to 17 liters. 

Bulk aside, this is still an excellent sleeping bag for those of you who don’t want to spend the money buying multiple sleeping bags for warm and chilly conditions. The One Bag allows you to consolidate down to a single sleeping for all your hiking trips, except extreme cold, and for a very reasonable price.

Western Mountaineering UltraLite

  • Material: Nylon Taffeta
  • Insulation: Down - 850 Fill
  • Length: 6’6”/6’0”/5’6”
  • Weight: 28 To 31oz
  • Compressed Volume: Approximately 8.5 Liters
  • Shoulder Girth: 60/59/59in
  • Very Lofty Down Fill For Comfort
  • Lightweight Design
  • Made In The U.S.A


The UltraLite from Western Mountaineering is everything we hope for in a down sleeping bag. Western Mountaineering has packed in plenty of the 850-fill power down to give this bag 5 whole inches of fluffy loft. The exterior shell fabric is also very soft to the touch. These two items work in tandem to propel the Ultralite to the front of the best 20 degree sleeping bags roundup in terms of comfort. 

As its name implies, the UltraLite has managed to pack all this comfort into a very lightweight design. The sleeping bag also compresses down nice and small to make packing your hiking bag a breeze. We’re also very pleased that Western Mountaineering manufactures their sleeping bags in the U.S.A, despite the fact that the prices are subsequently higher. 

But, if you’re willing to make the higher initial investment, you’ll have yourself an incredibly comfortable sleeping bag from a proven brand. We believe this will certainly pay off in the end as you take the Ultralite out on one hiking trip after another.

Western Mountaineering Alpinlite

  • Material: Nylon
  • Insulation: Down - 850 Fill
  • Length: 6’6”/6’0”/5’6”
  • Weight: 33/31/29oz
  • Compressed Volume: Approximately 12 Liters
  • Shoulder Girth: 65/64/63in
  • Extra Wide Shoulder Girth For Bigger Hikers
  • Very Comfortable And Warm Design
  • Made In The U.S.A


Don’t you hate trying to roll over in your sleeping bag and your shoulders seem to get wedged between the upper and lower layers? Us too, and that’s why the AlpinLite is among the best 20 degree sleeping bags. This bag is designed with you broad chested hikers in mind to make sure you can sleep in comfort on every single hiking trip. 

We’ve found the 63” to 65” shoulder girth to give just about everyone plenty of room to snuggle in and find that sweet spot for optimal sleeping. All other features of the AlpinLite are near identical to Western Mountaineering’s UltraLite sleeping bag. This bag is very comfortable due to its 850-fill down insulation nestled in a soft nylon shell. And it’s even manufactured in the U.S.A. 

As with most products from Western Mountaineering, the AlpinLite comes with quite the pricetag. But it’s premium build quality, comfortable materials, and very roomy design easily make this a worthwhile investment for you serious hikers out there.

Marmot Trestles Elite Eco

View Women's Version
  • Material: 40D Ripstop Nylon
  • Insulation: Synthetic
  • Length: Men’s: 78”/72”, Women’s 72”/66”
  • Weight: Men’s: 39oz, Women’s: 43oz
  • Compressed Volume: Men’s 8.4 Liters, Women’s 10.5 Liters
  • Shoulder Girth: Men’s: 64/62in, Women’s: 58in
  • Very Reasonable Price
  • Good Water/Moisture Resistance
  • Warm Enough For Most Hiking Trips


Synthetic insulation has been slowly retreating from the backpacking realm for some time, but it’s still a viable option for a budget hiker. The Trestles Elite Eco 20 is therefore our top synthetic recommendation for not breaking the bank but still hitting that 20 degree rating. 

The proprietary HL-ElixR insulation resists moisture reasonably well, which is certainly a benefit in wet weather. It’s also plenty warm for the majority of your hiking adventures and is very comfortable to curl up in. The drawback to this synthetic insulation, however, is that it is heavier than down and won’t pack down as much for transport. 

But we can’t argue with such a low price, and we definitely feel that the Trestles Elite Eco 20 is a great entry-level sleeping bag. Perfect if you plan on camping only intermittently, or aren’t ready to make a major investment quite yet.

Kelty Cosmic

View Women's Version
  • Material: 20D Nylon
  • Insulation: Down 600-Fill
  • Length: Men’s: 6’6”/6’0”/5’6”, Women’s 5’8”
  • Weight: Men’s: 42.7/38.6/35.9 oz, Women’s One Size: 41.0 oz
  • Compressed Volume: Men’s 13.1/12.2/9.8 L, Women’s 12.2 L
  • Shoulder Girth: Men’s: 64/62/58in, Women’s: 58in
  • Excellent Price For A Down Sleeping Bag
  • Hydrophobic Down Treatment To Resist Moisture
  • External Stash Pocket


Finally! A down sleeping bag that doesn’t leave our bank accounts in tears. The Kelty Cosmic 20 provides all the essentials we need in backpacking sleeping bag at a very reasonable price, earning it a place amongst the best 20 degree sleeping bags. 

The 600-fill power is definitely lower than most of the competition, but still manages to provide sufficient insulation in cooler temperatures. Kelty also includes a water repellent treatment to try and lockout as much moisture as possible and keep that down nice and fluffy. We’re also pleased with the external stash pocket to keep gear close, or store your favorite fuzzy sleeping socks when packing up in the morning. 

Keep in mind that the lower price of the Cosmic comes at the expense of build quality and materials. While certainly functional, it lacks the premium feel and durability of the competition. So if you’re liking the low budget Cosmic option, be sure to take care of it!

Sea to Summit Flame FmIII

  • Material: 30D Nylon Lining - 40D Nylon Shell
  • Insulation: Down 850-Fill
  • Length: 5’10”/5’7”
  • Weight: 26.3/23.5oz
  • Compressed Volume: 6.3/ 5.3 Liters
  • Shoulder Girth: 61”/59”
  • Designed Specifically For Women Hikers
  • Excellent Loft And Warmth
  • Lightweight For Weight Conscience Hikers


Ladies, if you’re on the search for a premium quality sleeping bag that’s designed exclusively for you, here it is. We know it’s technically rated to 25 degrees, but when combined with an EN lower temperature rating – an independent testing standard – of 14 degrees, we felt that the Flame qualifies for our list of the best 20 degree sleeping bags. 

First off, the build. All the dimensions of the Flame are tailored specifically for women. It’s therefore narrower in the shoulders and wider in the hips to provide the perfect fit and insulation. Speaking of insulation, you have quality 850-fill down providing all the warmth you need, which in turn packs down to a measly 6.3 liters. 

If you suspect this packability herald’s lower weight, you’re right. This sleeping bag weighs in at well under 2lbs, making it an ideal backpacking companion. Now the bad news – such a high quality bag has an equally high price-tag to match. But for you adventurers who live on the trail, having a premium sleeping bag designed for you can certainly make this initial investment worth it.

Therm-a-Rest Hyperion

  • Material: 10D Nylon Ripstop
  • Insulation: Down 900-Fill
  • Length: 6’6”/6’0”/5’6”
  • Weight: 22/20/19oz
  • Compressed Volume: 3.7 Liters
  • Shoulder Girth: 58”/57”/55”
  • Incredibly Lightweight
  • Packs Down To Almost Nothing
  • Very High Quality Down Fill


If you’re always struggling with your sleeping bag’s bulk or weight, then we highly recommend you consider the Hyperion 20 from Therm-a-Rest. This incredible sleeping bag weighs in at only 1lb 6oz. We know blankets and quilts that weigh more than that! What’s more, the Hyperion packs down to only 3.7 liters, taking up almost no room in your pack. 

So how’d they do it? High-quality down for one. The 900-fill insulation is incredibly lofty for excellent warmth, yet very compressible and lightweight when it’s time to move. The majority of the insulation is also located on the top portion of the sleeping bag, with less behind your back. As much as this insulation distribution helps the weight, it does mean you should have a decently insulated sleeping pad to keep from getting cold. 

Therm-a-Rest has also adopted a fairly narrow design that tapers significantly. This can be bad news for you side-sleepers out there as you may take the sleeping bag with you when you roll and expose the less insulated side to the air. But we understand that sacrifices have to be made to achieve such a lightweight design, and believe the Hyperion 20 may be every ultralight hiker’s dream.

NEMO Forte

View Women's Version
  • Material: 20D Nylon
  • Insulation: Synthetic Stratofiber
  • Length: Men’s: 6’6”/6’0”, Women’s 6’0”/5’6”
  • Weight: Men’s: 53/49oz, Women’s: 61/56 oz
  • Compressed Volume: Men’s 10 /9.3 Liters, Women’s 13.1/11.8 Liters
  • Shoulder Girth: Men’s: 66/64in, Women’s: 64/62in
  • Very Roomy Design For Side-Sleepers
  • Moisture Resistant Synthetic Insulation
  • ‘Heat Gills’ For Temperature Regulation


I count myself amongst the side-sleeping crew, and I know the struggle. Constantly pulling the sleeping bag every which way while getting comfortable. But the Nemo Forte and Viola offer a very compelling solution at a reasonable price! 

Both sleeping bags – the Forte for men and Viola for women – feature a unique spoon-shaped design that’s wider at the elbows and knees. This means you can naturally sleep on your side with your arms and legs bent, and not get caught on the wall of your sleeping bag. The sleeping bag also includes Nemo’s interesting heat gills, allowing you to dump excess heat without getting a cold draft. 

As with any synthetic sleeping bag, we must cope with more weight and less compressibility. This is nevertheless an excellent option for side-sleepers who yearn for a comfortable night’s sleep on the trail.





It’s an age-old question in the hiking sleeping bag debate, so let’s cover the pros and cons of each. Down has earned its stripes as the backpacking material of choice thanks to its excellent insulating properties yet very low weight. It also compresses down very well to take up minimal space in your back pack. Its two classic drawbacks are moisture and price.

Down will start to clump up almost immediately when it gets wet, effectively eliminating its insulating capability. Many manufacturers have implemented different down treatments in order to combat this problem, with varying degrees of success. Down is also much more expensive than synthetic materials. However, the price of some down sleeping bags has been creeping lower over the years, putting them on par with a synthetic bag. Just remember that cheaper down sleeping bags typically sacrifice quality and features.

As you may have guessed, synthetic is the opposite of down. The cheaper price and greater resistance to water are the main draws to this insulation. But keep in mind that synthetic material is significantly heavier and much bulkier than down, making it a tough sell in the backpacking field. But synthetic sleeping bags definitely have a place amongst beginner hikers or those on a budget.



It’s so easy to simply eyeball a sleeping bag online or in the store and think: ‘yup, that’s definitely big enough.’ Hold up, take a breath, and take a good look at the sizing chart!

Every single manufacturer has a slightly different sizing scheme for their sleeping bags. The common variables are height, shoulders, and hips; and they all fluctuate from bag to bag. We therefore highly recommend that you take the time to properly size yourself, and pick out a sleeping bag that’s guaranteed to fit you comfortably.

Or better yet, go to a gear store on a free afternoon and actually jump into the sleeping bag you’re thinking about. I know, it may seem weird climbing into a sleeping bag in the middle of a store, but there’s no better way to gauge the size.



If you’re looking for a sleeping bag with hiking or backpacking in mind, then you’d be wise to consider the bag’s weight. The heavier the sleeping bag, the more your overall pack weight. But the lighter your sleeping bag, the less space and insulation you have. So consider your priorities, and choose accordingly.

Remember, down is typically much lighter than synthetic materials, and will likely be your insulation of choice if weight is a concern. Ultralight sleeping bags will typically fall in the 1-2lbs range, whereas mid-range options will be 2-3lbs. Anything heavier than 3lbs may be a little hefty for weight conscience hikers and merit reconsideration.





Every single down sleeping bag on our list is accompanied by a fill-power number, ranging from 600 to 900. The exact definition is that the fill power number represents the number of cubic inches that one ounce of the down type takes up. But what does that mean for your warmth?

The higher that number, the greater the down’s insulating power. But the story doesn’t quite end there. Your warmth is also dependent on the sleeping bag’s fill weight, or simply the measurement of how much down the manufacturer stuffs in. This value is oftentimes listed, but sometimes not, so take note if it’s there! Outside Magazine has published a very informative article on all things down with more specific information if you wish.


All the sleeping bags on our list are rated to 20 degrees – with the sole exception of the Sea To Summit Flame whose 25 degree rating is balanced by a 14 degree EN rating. The majority of sleeping also have their manufacturer’s rating plus an EN value. But why are there two ratings in the first place, and what do they mean?

First of all, understand this: The published temperature rating without an EN designation is simply the manufacturer’s estimate of the temperature at which the bag will keep you warm, and has not been independently tested. These estimates are therefore highly subjective and are hard to gauge as everyone has different levels of warm comfort.

Enter EN 13537. This is a European testing standard that was introduced to level the playing field and ensure that sleeping bags are comparable. Many – but not all – sleeping bags will therefore feature an EN Comfort Rating and an EN Lower Limit Rating. The comfort rating refers to the tested temperature at which a cold sleeper will stay comfortable – usually found on women’s sleeping bags. The Lower Limit rating refers to the temperature at which a warm sleeper will stay comfortable – usually assigned to men’s sleeping bags.

The manufacturer’s rating will typically plop right in-between the EN comfort and limit ratings, but not always. So if the manufacturer has published EN ratings, take a look and make the most informed decision possible. Take a look at this article from REI for more temperature rating information.


This value – measured in liters – refers to the volume of your sleeping bag when it’s compressed as much as possible. Some sleeping bags come with their own compression sacks for achieving this ‘packed’ volume, while others require you to purchase this separately.

The smaller this value, the less space the sleeping bag is going to take up in your bag. Down once again jumps to the head of the pack in this herd as it features superior compressibility when compared to synthetic insulation.


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