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Kelty Cosmic 20 Down Mummy Sleeping Bag for Backpacking, Campers, 550 Fill Power, Recycled Fabrics with PFAS-Free DWR, Designed in Sunny Colorado,

Kelty Cosmic 20 Down Mummy Sleeping Bag for Backpacking, Campers, 550 Fill Power, Recycled Fabrics with PFAS-Free DWR, Designed in Sunny Colorado,

$179.95

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Kelty Cosmic 20 Down Mummy Sleeping Bag for Backpacking, Campers, 550 Fill Power, Recycled Fabrics with PFAS-Free DWR, Designed in Sunny Colorado,

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzed reviews to verify trustworthiness.Learn more how customers reviews work on Amazon






Customers say

Customers find the sleeping bag keeps them warm in cold weather and appreciate its quality, comfort, and lightweight design. The bag compresses well and is suitable for backpacking, with one customer noting it's great for multiple-day trips. While some customers find the size and fit good, others mention it's too tight at the shoulders. Customers consider it excellent value for the price.

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36 customers mention warmth, 34 positive, 2 negative

Customers find the sleeping bag very warm and toasty, with one customer noting it maintained a temperature of about 30 degrees at night.

I love this bag, as it is very comfortable and warm, but… At 5'10", regular length fit me fine. But at about 215lbs, it's a tight fit….Read more

Very warm, high quality bag! I’ve owned several sleeping bags and I got this as a spare but I wanted to try it out and was very pleasantly surprised!…Read more

Excellent quality and lightweight. The down feeling is super warm and toastyRead more

Phenomenal sleeping bag. Keeps you warm, and if you sleep hot, this thing can be a furnace even near the limit temperature….Read more

26 customers mention quality, 26 positive, 0 negative

Customers find the sleeping bag to be of excellent quality, with one customer noting it's a great starter option for backpacking.

…I gave it 5 stars because all in all, it's a great bag, just not the best for me. I have not stopped using it, but I may switch to the roomier bag….Read more

…The zipper is really easy to zip up in the dark is good quality. It rolls up super small and fits in the saddlebag of my motorcycle.Read more

Excellent quality and lightweight. The down feeling is super warm and toastyRead more

Amazing, best sleepingbag ever!Read more

22 customers mention comfort, 21 positive, 1 negative

Customers find the sleeping bag comfortable, with one mentioning it stays cozy down to freezing temperatures.

I was so comfortable! If I got a little warm I unzipped , if little too cold zipped up. I shoved extra close in the hood and used it for my pillow….Read more

Warm, comfy, packs down into my 15L side bag in motorcycle just barelyRead more

…Got down to 37 degrees at night but I was cozy. Love the small size it folds up in a small case. Perfect for backpacking.Read more

Love this sleeping bag! I found it super cozy and light enough to backpack with….Read more

19 customers mention size, 16 positive, 3 negative

Customers like the sleeping bag's size, as it rolls up very small and packs down compactly. One customer mentions it has plenty of leg room to move around inside, while another notes it has a wide toe box.

…Super comfy and kept me warm in 36F tent camping. Very soft and rolls up easily back into provided storage sack.Read more

…It compresses down very small which is awesome.Read more

…It packs down pretty small which is great for multiple day trips when I need to pack lots of other stuffRead more

Packs down small, relatively light, a great value too!Read more

14 customers mention lightweight, 11 positive, 3 negative

Customers appreciate that the sleeping bag is relatively light.

Excellent bag, well built, lightweight, and warm, perfect for backpacking. Comfortable down to about freezing (32°f)….Read more

…It is very lightweight, which was his main concern on his long hikes. Bonus: Rolling up and getting back in the travel bag is very easy!Read more

Love this sleeping bag! I found it super cozy and light enough to backpack with….Read more

…It's not ultralight, but it's light enough for most weekend or multi-day hikes….Read more

10 customers mention backpacking, 10 positive, 0 negative

Customers find the sleeping bag suitable for backpacking, with one mentioning it's great for multiple day trips.

Excellent bag, well built, lightweight, and warm, perfect for backpacking. Comfortable down to about freezing (32°f)….Read more

Don't put in washer!!!! Very cozy and warm and perfect size! Good for backpacking and camping in cold weather.Read more

Excellent sleeping bag, rolls up very small, ideal for backpacking. It’s also very fluffyRead more

Awesome sleeping bag. Great for camping, light and warm.Read more

9 customers mention value for money, 8 positive, 1 negative

Customers find the sleeping bag to be a great value, offering the best quality for the price.

…Great bag for the price.Read more

Packs down small, relatively light, a great value too!Read more

…and for the price, this is probably one of the best value down bags out there….Read more

Excellent quality, a great buy for our grandkids.Read more

14 customers mention fit, 7 positive, 7 negative

Customers have mixed opinions about the sleeping bag's fit, with some finding the size and mummy shape good, while others report it being too tight at the shoulders.

…small female, so I had plenty leg room to move around inside and not feel cramped….Read more

…Only downside is the mummy shape is a bit snug if you toss and turn. But the footbox has enough space and I still slept comfortably….Read more

Tight fit for guys with broad shoulders….Read more

Using it for the first time right now and my shoulders don't fit inside. I am 6' tall the bag supposedly fits 6' people….Read more


Warm, Reliable, and Backcountry-Tested

5 out of 5 stars

Warm, Reliable, and Backcountry-Tested
Backcountry approved ✅ I used the Kelty Cosmic Down 20 on a recent 4-day trip in the Emigrant Wilderness, and it performed better than expected. I paired it with a Z Lite Sol foam pad and even added a layer of fresh ferns underneath for insulation and cushion. I slept right next to a fire in a well-ventilated area, and despite the dropping temps, I stayed consistently warm all night.
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Top reviews from the United States


  • Josh P

    5.0 out of 5 stars

    Warm and packs down well

    Reviewed in the United States on October 21, 2025

    Size: StandardColor: Dark BlueVerified Purchase

    I bought the Kelty Cosmic Down 20 for fall backpacking trips and so far it has totally exceeded expectations. It kept me warm in temps down to the high 20s °F with just a base layer and a decent sleeping pad. The down insulation lofts up nicely, and I really like the hood and draft collar features—little things that make a big difference on cold nights.
    It packs down smaller than I expected (fits in my 50L pack with room to spare), and for the price, this is probably one of the best value down bags out there. It's not ultralight, but it's light enough for most weekend or multi-day hikes.
    Only downside is the mummy shape is a bit snug if you toss and turn. But the footbox has enough space and I still slept comfortably.
    Highly recommend for 3-season use if you want warmth and quality without breaking the bank.

    8 people found this helpful

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  • Ralph Doellman

    5.0 out of 5 stars

    Tight at the shoulder

    Reviewed in the United States on September 6, 2025

    Size: LongColor: Dark BlueVerified Purchase

    Excellent bag, well built, lightweight, and warm, perfect for backpacking. Comfortable down to about freezing (32°f). I am 6' 2" tall, about 26" across at the shoulder. I purchased the long version. Length is good probably fit a guy up to 6' 6". However the bag is "snug" at the shoulder and arms. Not tight per say but not a lot of room eather. Difficult to fully zip and unzip because it is tight with one arm flexed or "bent" in order to zip. If you are a barrel chested, muscular, or husky man you are not going to like this bag. I have taken to using it as a blanket. Otherwise very happy.

    6 people found this helpful

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  • Ellie

    5.0 out of 5 stars

    Perfect!

    Reviewed in the United States on January 13, 2026

    Size: WomensColor: Deep Lake TealVerified Purchase

    Don't put in washer!!!! Very cozy and warm and perfect size! Good for backpacking and camping in cold weather.

    One person found this helpful

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  • Jen Diamon

    5.0 out of 5 stars

    Warm and compact sleeping bag!

    Reviewed in the United States on March 12, 2026

    Size: StandardColor: Dark BlueVerified Purchase

    I was skeptical about the sleeping bag because of how small it is, but it keeps me really warm. I love sleeping in the cold with a warm blanket and the sleeping bag kept me nice and toasty. The zipper is really easy to zip up in the dark is good quality. It rolls up super small and fits in the saddlebag of my motorcycle.

    One person found this helpful

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  • Bo

    5.0 out of 5 stars

    Best quality for the price!

    Reviewed in the United States on February 5, 2026

    Size: StandardColor: Dark BlueVerified Purchase

    Very warm, high quality bag! I’ve owned several sleeping bags and I got this as a spare but I wanted to try it out and was very pleasantly surprised! Not only was the stitching and zipper high quality, but it retained heat much better than I expected for how light it is. 10/10 would recommend to anyone in need of a sleeping bag!

    One person found this helpful

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  • Elizabeth

    4.0 out of 5 stars

    Very warm, wish it had a good way to vent.

    Reviewed in the United States on August 24, 2025

    Size: WomensColor: Deep Lake TealVerified Purchase

    Very warm, just wish it had a few vents in it. I'm 4'10 so trying to find something with out too much extra space is a struggle. I recently used this on a camping trip where it got to the low 30s at night on a humid mountain. I was honestly afraid I was going to be super cold but instead I sweat the entire night. I ended up unzipping the side but that left me a little too cold. If this thing had a 2 way zipper so you could just do a small portion or some vents it would have been perfect! Overall I guess id rather be too warm than too cold so can't complain too much.

    8 people found this helpful

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  • Jack Howard

    5.0 out of 5 stars

    Great sleeping bag for women

    Reviewed in the United States on March 4, 2026

    Size: WomensColor: Deep Lake TealVerified Purchase

    Got this as a gift for my girlfriend and she loves it. The size and fit is good for her she is 5’9”. The thickness is designed for women giving her a comfortable night sleep. We are impressed by the quality of the down and the quality of the zipper. Good value for the price as well. Probably could be better but we are happy with it.


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  • Zita

    5.0 out of 5 stars

    Soft and cozy, yet lightweight

    Reviewed in the United States on January 16, 2026

    Size: WomensColor: Deep Lake TealVerified Purchase

    Excellent sleeping bag, rolls up very small, ideal for backpacking. It’s also very fluffy


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Product Summary: Kelty Cosmic 20 Down Mummy Sleeping Bag for Backpacking, Campers, 550 Fill Power, Recycled Fabrics with PFAS-Free DWR, Designed in Sunny Colorado,

From Kelty
Recycled Nylon and Recycled Polyester Taffeta
Imported
A KELTY CLASSIC: The cosmic 20 has long been a staple of Kelty’s backpacking lineup and a favorite of campers worldwide with 550 FP compressible down, silky soft fabrics, dual direction zippers, the cosmic is built for comfort at the campsite
PFAS FREE AS IT SHOULD BE: None of that toxic stuff here – Recycled nylon and polyester taffeta shell and liner fabrics to keep even more out of the landfill, finished with durable water repellent. Planet Earth approved
SUSTAINABLE + TRACEABLE DOWN: Did we mention all our down is 100% ethically sourced and traceable via RDS? Info on product tag to trace each specific batch of down, Kelty means business when it comes to sustainability.
1952: Since Eisenhower was in the oval, Kelty has been designing camping gear in sunny Colorado. A founding member of The Conservation Alliance, Kelty continues to lead the industry with quality gear for your outdoor shenanigans on or off the trail
THE DEETS: Each size up represents additional 6” of total length: Short fits sleepers up to 5’ 6”, Regular 6’, Long 6’ 6”. ISO limit rating 21 degrees, ISO extreme rating -11 degrees. Total weight about 2 lbs. 6 oz. (regular) stuffed size 13 x 7”

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