Kelty

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

114+ bought in the past month

$179.95
sizeS

About this item

  • 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”
$179.95

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Product details

BrandKelty
ColorDark Blue
Occupancy1 Person
ShapeMummy
Seasons3 Seasons
Temperature Rating20 Degrees
Age Range (Description)Adult
SportCamping & Hiking, Backpacking
Special FeatureHighly Compressible and Lightweight, RDS Certified Down, Recycled Shell + Liner Fabrics
MaterialNylon, PFC-free DWR

Technical specifications

item_package_dimensions_l_x_w_x_h14.41 x 7.87 x 6.14 inches
package_weight1.3 Kilograms
item_dimensions_lxwxh84 x 30 x 3 inches
item_weight2.85 Pounds
brand_nameKelty
warranty_descriptionKelty Limited Lifetime Waranty
model_nameCosmic Down Mummy
colorDark Blue
materialNylon, PFC-free DWR
suggested_usersunisex-adult
manufacturerKelty
part_number35413724LR
model_year2024
styleUpdated Version
included_componentsKelty Cosmic 20 Sleeping Bag, Kelty Limited Lifetime Warranty, Stuff Sack
outer_materialRecycled 20D Nylon Taffeta
fill_material_typeDown
sizeLong
sport_typeCamping & Hiking, Backpacking
best_sellers_rank#12,884 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #34 in Camping Sleeping Bags
date_first_availableJanuary 18, 2024

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Customer reviews

4.7203 ratings

Customers say

Customers find the sleeping bag keeps them warm in cold temperatures and appreciate its high quality, comfort, and lightweight design. Customers consider it a great value for the price.

★★★★★

Warm and packs down well

Josh POctober 21, 2025✓ Verified 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. Read more

★★★★★

Tight at the shoulder

Ralph DoellmanSeptember 6, 2025✓ Verified 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. Read more

★★★★★

Perfect!

EllieJanuary 13, 2026✓ Verified purchase

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

★★★★★

Best quality for the price!

BoFebruary 5, 2026✓ Verified 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! Read more

★★★★☆

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

ElizabethAugust 24, 2025✓ Verified 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. Read more

★★★★★

Soft and cozy, yet lightweight

ZitaJanuary 16, 2026✓ Verified purchase

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

★★★★★

Soft, warm, comfy and rolls up easily back into provided storage bag

German car nutFebruary 10, 2026✓ Verified purchase

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

★★★★★

Excellent product.

clifton errol millerJanuary 30, 2026✓ Verified purchase

I've had this bag in very cold ❄️ weather and stayed warm,kelty is a good brand. Read more

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