Kelty Cosmic Synthetic Sleeping Bag 0F
- 0 degree temperature rating
- Up to 6 ft 6 in sleepers, Long size
- 4 lbs 11 oz total weight, 60 oz fill
- 17 x 11 inch stuff size, non-compressed
- CirroLoft ECO synthetic, 100% recycled fibers
- 20D recycled nylon shell, PFAS-free DWR
- Mummy shape, zipper closure
- Limited lifetime warranty
Updated 20 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A cold rated synthetic mummy bag that stays warm when damp and comes with a compression stuff sack. It is heavier and bulkier than a down bag of the same rating.
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ASIN: B0DPXRLQLHModel: Cosmic Synthetic 0Category: Sleeping Bags
Overview
Not a down bag, the Kelty Cosmic Synthetic uses CirroLoft ECO synthetic fill that holds its warmth in damp conditions. A contoured hood, full draft collar and offset quilting trap heat, and an integrated compression stuff sack packs it down.
Synthetic insulation is the reason to choose it for wet trips, since it holds its loft when moisture gets in. The penalty is weight and pack size, which backpackers counting ounces will feel.
Who it's for
Winter car campers and backpackers heading into wet, cold shoulder seasons will value the synthetic fill. Hikers chasing the lightest load should look at down.
Pros and cons
- Synthetic fill warms when damp
- Recycled insulation and shell
- Compression stuff sack included
- Roomy natural fit footbox
- Heavy for a backpacking bag
- Bulky compared with down
- Title and specs disagree on size
Performance notes
Warmth depends on the loft of the synthetic fill and how well the hood and draft collar seal heat in. Offset quilting staggers the stitch lines so there are no thin seams for cold to leak through. The DWR shell sheds light moisture, but the insulation is what holds warmth when it gets wet.
Specifications
| Brand | Kelty |
|---|---|
| Model | Cosmic Synthetic 0 |
| Dimensions & fit | |
| Maximum Height Recommendation | 78 inches |
| Size | Long (2025) |
| Item weight | 4 lbs 11 oz |
| Fill weight | 60 oz |
| Item Dimensions L x W | 74 x 30 inches |
| Stuff size | 17 x 11 inches, non-compressed |
| Capacity & performance | |
| Temperature Rating | 0 degrees F |
| Construction & materials | |
| Fill Material Type | Synthetic, CirroLoft ECO |
| ShellMaterial | 20D recycled nylon, PFAS-free DWR |
| Fabric Type | Nylon, polyester taffeta lining |
| Color | Fired Brick Red |
| Included components | |
| Included Components | Sleeping bag, stuff sack with compression straps |
| Warranty & support | |
| Warranty Description | Kelty Limited Lifetime Warranty |
| Other details | |
| Occupancy | 1 person |
| Shape | Mummy |
| Closure Type | Zipper |
Frequently asked questions
What comes with the Kelty Cosmic Synthetic 0?
The sleeping bag and a stuff sack with integrated compression straps, covered by the Kelty Limited Lifetime Warranty.
Is the Kelty Cosmic Synthetic 0 a down bag?
No. It uses CirroLoft ECO synthetic insulation made from 100% recycled fibers.
Is this the regular or long Kelty Cosmic Synthetic?
The title says Regular, but the specs list Long (2025) and a 78 inch maximum height. Confirm the size before ordering.
How small does the Kelty Cosmic Synthetic 0 pack?
The stuff size is 17 x 11 inches before compression. The compression straps shrink it further, but a compressed size is not given.