How to Choose Sleeping Bags for Backpacking
Kelty Cosmic 20 Sleeping Bag - Men's
$169.95 – to $199.95
Sleep comfortably through the night with the men's Kelty Cosmic 20 sleeping bag. With 550-fill-power down and a thermally efficient trapezoidal baffle construction, it's a 3-season superstar.
Key Details
Fill
550-fill-power down
Weight
Short: 2 lbs. 3 oz.
Regular: 2 lbs. 7 oz.
Long: 2 lbs. 11 oz.
Temperature Rating (F)
20 degrees (F)
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- Innovative trapezoidal baffle construction provides thermal efficiency
- Lightweight and warm 550-fill-power down
- Zippered internal stash pocket for your headlamp or cellphone
- Quad stitch antisnag zipper design makes it easy to get in and out
- Buttery-soft and durable 20-denier nylon shell fabric
- Dual locking sliders for venting versatility
- Expanded, natural-fit footbox provides more room to wiggle your toes
- Recycled liner and shell for a happier, healthier planet
- Environmental and health-friendly C0 and PFC-free durable water repellent (DWR) fabrics
- Full draft tube and collar retain heat while maintaining comfort
- Included stuff sack allows for quick and easy departures
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View the Kelty Cosmic Product LineView all Kelty Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 21 degrees (F) - ISO |
| Tested Comfort | 31 degrees (F) - ISO |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Weight | Short: 2 lbs. 3 oz. Regular: 2 lbs. 7 oz. Long: 2 lbs. 11 oz. |
| Shell | Recycled 50-denier polyester taffeta |
| Zipper Location | Right |
| Insulation Type | Down |
| Fill | 550-fill-power down |
| Fill Weight | Short: 14.6 oz. Regular: 1 lb. 0.4 oz. Long: 1 lb. 2.8 oz. |
| Sleeping Capacity | 1-person |
| Lining | Recycled 20-denier nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Short: 66 inches Regular: 72 inches Long: 78 inches |
| Shoulder Girth (in.) | Short: 58 inches Regular: 62 inches Long: 64 inches |
| Hip Girth (in.) | Short: 56 inches Regular: 58 inches Long: 60 inches |
| Stuff Sack Size | Short: 7 x 13 inches Regular: 8 x 13 inches Long: 8 x 14 inches |
| Stuff Sack Volume | Short: 10.4 liters Regular: 10.7 liters Long: 11 liters |
| Gender | Men's |
| Sustainability | Contains recycled materials |
Buying Advice
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Most Helpful Favorable Review
Warmer than expected
Matthew1 year ago
I bought this to get a more compact bag than my Nemo 20 F comfort bag. This Kelty one is rated 30 F comfort, but I felt more comfortable in this than the Nemo. I'm thinner and tend to get chilly easy, especially around my feet. I used it over a few nights in the mountains around 33 F. The second night was a little warmer, mid 30s, and just to test the limits I tried it on top of a mountain bald, totally exposed over a clear sky night -- really great star gazing. I did pack a tarp in case I needed it, but opted to just sleep only in the bag with no cover, on my Therm-a-Rest Z Lite Sol pad. The winds gusted about 15 - 20 miles per hour pretty consistently, but this bag kept me comfortable! I did wake up in the middle of the night to some dew on the top layer, but the down itself stayed pretty dry (I think due to the wind). Packs relatively small for a winter bag too!
Matthew
Asheville, NC
18 people found this review helpful
Most Helpful Critical Review
NOt a cold-weather bag at all
Eusebio8 months ago
I have a "CosmicDown" version, rated to 0 degrees F and -18C both on the bag and the included stuff sack. The insulation is actually 80% duck down and 20% "polyester fiber." It is a comfortable bag, but the temperature rating is preposterously wrong. I camp mostly in AZ, and on nights in the mountains when the temperature is about freezing, I get cold in the is bag even when wearing Smartwool or fleece long johns, Smartwool top, and a puffer jacket. Inside a tent, and sometimes even when this Kelty bag is slipped inside a larger fleece bag. This is a summer-weight bag.
Eusebio
Scratchy Rocky Desert, AZ
6 people found this review helpful
Customer Images
Matthew
Asheville, NC
Warmer than expected
1 year ago
I bought this to get a more compact bag than my Nemo 20 F comfort bag. This Kelty one is rated 30 F comfort, but I felt more comfortable in this than the Nemo. I'm thinner and tend to get chilly easy, especially around my feet. I used it over a few nights in the mountains around 33 F. The second night was a little warmer, mid 30s, and just to test the limits I tried it on top of a mountain bald, totally exposed over a clear sky night -- really great star gazing. I did pack a tarp in case I needed it, but opted to just sleep only in the bag with no cover, on my Therm-a-Rest Z Lite Sol pad. The winds gusted about 15 - 20 miles per hour pretty consistently, but this bag kept me comfortable! I did wake up in the middle of the night to some dew on the top layer, but the down itself stayed pretty dry (I think due to the wind). Packs relatively small for a winter bag too!
Age:25–34
Weight:125–150 lbs.
Height:5'9"
Yes , I recommend this product
TrailViews
Michigan
great overall bag
11 months ago
This is a fantastic product. It is extremely lightweight and stuffs easily into its sack. It fits into the sleeping bag pouch of three different packs with very little effort. I have been out in the woods 2 times now where the temps have hit high 30s and I’ve been more than comfortable. I am 6’1” and got the long version. There is room to put my inflatable pillow in the hood before zipping it up. Very comfortable and warm bag that packs away easily. Not going to find a better value in a sleeping bag.
Age:35–44
Weight:175–200 lbs.
Height:6'1"
Yes , I recommend this product
barbersj
Pensacola
solid
1 year ago
Great product and price. Slept in 31 degree weather and stayed really warm. My only complaints are the zipper (can be a pain) and hood is huge though I fit my Nemo Pillow in it.
Age:35–44
Weight:150–175 lbs.
Height:5'9"
Yes , I recommend this product
HikeNDad
Phoenix, AZ
A good bang for your buck
11 months ago
Let me start by saying this is a great value bag. It does what it supposed to do. Keeps you warm and is surprisingly cozy. I like the collar flap that allows you to vent or fold in for additional warmth. Reasonably lightweight and compact. The only knock on the bag is the zipper. It’s flimsy definitely not robust like your higher end bags. You have to be very gentle not to catch fabric.
Age:35–44
Weight:150–175 lbs.
Height:5'10"
Yes , I recommend this product
lupin
Very satisfied, great value
11 months ago
As a woman, I wasn't sure if I should get this or the women's version, but I was very pleased with this sleeping bag. I felt like I got a lot of value for the price, as this is lightweight and soft. I don't camp a ton but I have always struggled with feeling cold in any sleeping bag outdoors before trying this one. Not any more! Used it twice this year in mild/cool nights and I was so comfortable.
Weight:100–125 lbs.
Height:5'3"
Yes , I recommend this product
Nak
Too chilly
3 months ago
Pros: Bag material is comfortable. The bag is very, very light and packs away small Con: Did not feel warm enough in this bag. Tested overnight with a low temperature of 42 F in dry desert night air. Was not freezing inside the bag, but was not comfortable enough to sleep warmly, even after adding layers of clothing. After a couple of hours, switched to a different 20 F bag and felt warm. I could see how this bag might work for people sleeping in jackets while backpacking, but it doesn't work for my campground camping.
Age:35–44
Weight:150–175 lbs.
Height:5'9"
No, I do not recommend this product
Marius
New Jersey
Best value for money
1 year ago
This sleeping bag is exceptionally cozy and warm, with a high-quality exterior material that feels excellent to the touch. I tested it at high elevations in the Adirondacks, upstate NY, during the spring season and never experienced any cold. The design features a long zipper, which is particularly useful for temperature regulation when it gets too warm. The regular size accommodates a 6-foot person perfectly, ensuring a comfortable fit.
Age:25–34
Weight:175–200 lbs.
Height:6'0"
Yes , I recommend this product
Eusebio
Scratchy Rocky Desert, AZ
NOt a cold-weather bag at all
8 months ago
I have a "CosmicDown" version, rated to 0 degrees F and -18C both on the bag and the included stuff sack. The insulation is actually 80% duck down and 20% "polyester fiber." It is a comfortable bag, but the temperature rating is preposterously wrong. I camp mostly in AZ, and on nights in the mountains when the temperature is about freezing, I get cold in the is bag even when wearing Smartwool or fleece long johns, Smartwool top, and a puffer jacket. Inside a tent, and sometimes even when this Kelty bag is slipped inside a larger fleece bag. This is a summer-weight bag.
Age:65–74
Weight:150–175 lbs.
Height:5'10"
No, I do not recommend this product
jtchil0
Chicago Suburbs, IL
Can't recommend this bag.
2 months ago
My son received this bag from his grandparents (per our request) to take to Philmont Ranch with Scouts. It worked fine for Philmont in Summer 2024, and we washed it following the instructions and hung it for the season. I took it out for a spin this last weekend for the first time since my son's trip and it got to 40F overnight. I soon noticed that if I turned on my side, such that the bottom was exposed to the air, that my back would get cold immediately. It became clear that some of the baffles on the back side of the bag where practically empty of down. There was one baffle very full of down. When I got home I could see even better that all the down seemed to have moved into one baffle (see photo). Unfortuntely, since we didn't use it over the winter, I didn't realize this issue until a month after the warrantee expired which is frustrating. It kind of makes it useless for cold weather. I can't honestly recommend this with such an obvious flaw. After this happened I searched for those with similar experience and found these: https://www.reddit.com/r/myog/comments/cwnlr8/down_relocating_between_baffles_or_disappearing/ https://www.reddit.com/r/backpacking/comments/11jjf2y/washed_sleeping_bag_now_these_4_baffles_have_zero/ Amazingly, Kelty has a page about this. The washing label on the sleeping back says washing machine is acceptable. On the website they say "don't use a washing machine if you want to avoid this problem". Again, it's sad they would mislead the customer this way. https://help.kelty.com/support/solutions/articles/9000192344-down-has-shifted-in-my-sleeping-bag-what-do-i-do-
Age:45–54
Weight:150–175 lbs.
Height:5'9"
No, I do not recommend this product
Cimarroncita
Thunder Bay, ON
The best budget down bag
1 year ago
Purchased this about 3 years ago to use backpacking and floatpacking. I’m 6’4” and bought the long, which is perfect. It has been incredibly warm, even in the Canadian shoulder seasons, and is very light and packable. With a compression sack it gets to the size of a cantaloupe. The only problem I’ve had with it is that the seams are starting to pull apart after around 125-150 nights sleeping in it.
Age:18–24
Weight:150–175 lbs.
Height:6'4"
Yes , I recommend this product
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