Kelty
Cosmic Synthetic 20 Degree
Best reliable warmth for budget conscious campers and backpackers.
This three-season mummy bag balances weight and warmth for backpackers seeking a reliable trail companion. Engineered with synthetic insulation, it offers consistent thermal performance even in damp conditions, while the soft-touch fabrics ensure comfort during rest. A spacious footbox design provides extra room for natural movement, and the inclusion of a dedicated stash pocket keeps small essentials secure. Designed for those who prioritize efficiency and value, this bag delivers a practical solution for overnight adventures without the complexity of down alternatives. It remains a dependable choice for hikers looking to maximize their outdoor time comfortably.
$119.95
More Cosmic Options
Cosmic 20
$159.95
Cosmic Down 20
$189.95
Cosmic Synthetic 0 Degree
$139.95
Cosmic 20 Degree Sleeping Bag
$159.95
Cosmic Ultra 20 Degree
$269.95
Cosmic
$314.95
Cosmic 20 Sleeping Bag (Long)
$109.95
Cosmic 40
$119.95
Cosmic Synthetic 20
$109.95
Cosmic 20 Sleeping Bag
$118.22
Cosmic Ultra 0°F Sleeping Bag
$219.95
Cosmic Ultra 800 DriDown Sleeping Bag
$184.48
Cosmic 0 Synthetic Sleeping Bag
$129.95
Cosmic 20 Sleeping Bag
$118.22
Cosmic Ultra 0°F
$245.97
Kelty Cosmic 20
$169.99
Kelty Cosmic Synthetic 0 Degree Sleeping Bag
$166.00
Kelty Cosmic Down 20
$189.95
Kelty Cosmic Ultra 0
$369.95
Cosmic Synthetic 40 Degree
$99.95
Cosmic Synthetic 20
$109.95
Owner Satisfaction
4.5
/ 5
Category Rank
1010
/ 2020
#1010 in Sleeping Bags
Price vs Category Average
-28%
Below average
ISO Comfort Temp Rating
32
/ °F
Who it's for
- Campers and backpackers facing humid or rainy environments
- Budget-conscious adventurers seeking dependable three-season warmth
- New outdoor enthusiasts and those prioritizing longevity and low maintenance
- Sleepers who prefer more space and comfort inside their sleeping bag
Who should skip it
- Ultralight backpackers and those with limited pack space
- Long-term adventurers seeking maximum durability in insulation performance
- Hikers and climbers prioritizing minimal volume in their gear
Performance breakdown
Thermal Efficiency
CirroLoft insulation provides reliable, consistent warmth even when conditions turn damp.
Weight-to-Warmth Ratio
Solid performance for synthetic, though heavier than premium down alternatives.
Footbox Comfort
Natural-fit design offers generous space for restless sleepers to move freely.
Durability
Robust nylon taffeta shell stands up well to rugged trail use.
Moisture Management
Synthetic fill and PFC-free DWR coating excel in humid environments.
Packability
Synthetic bulk requires more pack space than comparable down sleeping bags.
Key Specs
ISO Comfort Temp Rating
32°F
ISO Limit Temp Rating
22°F
Max User Height
78 inches
Length
84 inches
Shoulder Width
32 inches
Total Weight
2.99 lbs
Fill Weight
33 oz
Insulation
CirroLoft synthetic
Know before you buy
Unlike down, which loses its insulating properties when wet, the CirroLoft synthetic insulation retains its loft and thermal efficiency even in damp conditions. This makes it a reliable choice for humid climates or unpredictable shoulder-season weather where moisture management is a priority.
The bag has an ISO Comfort rating of 32°F and an ISO Limit rating of 22°F. This means most sleepers will feel comfortable around freezing, but you should consider a sleeping bag liner or extra layers if you plan to camp in temperatures closer to the 22°F limit.
Yes, this bag accommodates users up to 78 inches (6'6") tall. With an overall length of 84 inches, it provides enough clearance for taller hikers to stretch out comfortably.
The bag features a 'natural-fit' footbox designed specifically to allow your feet to rest in their natural position rather than forcing them into a pointed shape. This provides significantly more room for toe movement than traditional mummy bags, which often feel cramped.
The total weight is 2.99 lbs. While it is heavier than high-end down alternatives, it is a practical, mid-weight option for backpackers who prioritize durability and moisture resistance over shaving every possible ounce.
The PFC-Free DWR (Durable Water Repellent) is an environmentally friendly treatment applied to the shell that helps water bead up and roll off the fabric. It provides essential protection against light moisture and condensation without using chemicals that are harmful to the environment.
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$120