Kelty Cosmic 20 Down Mummy Sleeping Bag
for Backpacking, Campers, 550 Fill Power, Recycled Fabrics with PFAS-Free DWR, Designed in Sunny Colorado…
Price as of 2026-06-02. Check Amazon for the current price.
Quick Decision
Price Intelligence
- Budget:$9–$30
- Mid-range:$30–$76
- Premium:$76+← You are here
Is This Right For You?
- •Buyers who prioritize quality over price in Sleeping Bags
- •Those who want a top-rated option — in the top 6% of Sleeping Bags by rating
- •Kelty loyalists — the brand spans 27 products in our database
- •You're on a tight budget — $143 above the category average of $65
- •Coleman Heritage Big & Tall 10°F Flannel Sleeping Bag — 60% cheaper at $83 (Score B)
📊 Based on data analysis of 110 products in this category.
Mubboo Score: C+
How we calculate the Mubboo Score
Quality (45%): customer rating, normalized to a 10-point scale
Popularity (35%): review volume vs the category leader, log-scaled
Value (20%): price position vs other Sleeping Bags
Computed from live Amazon rating, review count, and price across 110 Sleeping Bags available to US consumers · last refreshed 2026-06-02.
How It Compares
This Product Kelty Cosmic 20 Down Mummy Sleeping Bag | Most Popular TETON Sports Teton Outfitter XL Sleeping Pad | Best Rated Coleman Heritage Big & Tall 10°F Flannel Sleeping Bag | Best Value Gear Doctors ® ApolloAir 5.2 R-Value [17oz] Ultralight Insulated | |
|---|---|---|---|---|
| Price | $207.46 | $105.49 | $82.99 | $84.99 |
| Rating | 4.7/5 | 4.6/5 | 4.7/5 | 4.4/5 |
| Reviews | 253 | 4,191 | 3,772 | 2,811 |
| Mubboo Score | C+ | B | B | B- |
Quick Specs
- Size
- Long
- Color
- Dark Blue
- Shape
- Mummy
- Sport
- Camping & Hiking, Backpacking
- Seasons
- 3 Seasons
- Material
- Nylon, PFC-free DWR, [lining] 50D polyester
- Occupancy
- 1 Person
- Sport Type
- Camping & Hiking, Backpacking
What People Say
Synthesized from 40 reviews · 100% verified purchases.
Check inflatable pad valves for leaks before trips. Be prepared for sleeping bag zippers that may snag and a potentially too-warm interior; a liner can help with stickiness.
- Lightweight & compact
- Comfortable & pain-free
- Great value
- Easy inflation/deflation
- Good warmth retention
- Valve air leak
- Zipper snags/sticks
- Difficult to repack
- Too hot/sticky interior
Key Features
- ✦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 dire…
- ✦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…
- ✦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 bus…
Source: product listing on Amazon.
About Kelty
- 27 products in our database
- Average rating: 4.5/5 across all products
- Price range: $34.94 – $399.95
- Categories: Baby Carriers, Camping Chairs, Camping Tents, Hammocks, Hiking Backpacks, Mattresses
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Bottom Line
Kelty Cosmic 20 Down Mummy Sleeping Bag earns Mubboo Score C+. Priced at $207 — a premium option, above the category average of $65. Rated 4.7/5 from 253+ reviews. Strong buy if: buyers who prioritize quality over price in sleeping bags, those who want a top-rated option. Skip if: you're on a tight budget — TETON Sports Teton Outfitter XL Sleeping Pad (Score B, $105) may fit better.
Frequently Asked Questions
Is the Kelty Cosmic 20 Down Mummy Sleeping Bag worth buying in 2026?
It earns a Mubboo Score of C+, with a 4.7/5 rating from 253 reviews — better than 94% of Sleeping Bags we track.
How much does the Kelty Cosmic 20 Down Mummy Sleeping Bag cost?
It is currently $207.46 — premium-tier pricing for Sleeping Bags.
How does the Cosmic 20 Down Mummy Sleeping Bag compare to other Sleeping Bags?
The category's most-reviewed alternative is the TETON Sports Teton Outfitter XL Sleeping Pad (4.6/5, 4,191 reviews, $105.49). The Cosmic 20 Down Mummy Sleeping Bag carries a Mubboo Score of C+ vs B.
Sources & References
Products available through US retailers. Prices in USD. Sales tax varies by state and is not included.
Mubboo may earn a commission on purchases made through affiliate links. This does not affect our Mubboo Score, product rankings, or editorial judgments. Prices are accurate as of the last sync (2026-06-02) and may change.