Kelty
Kelty Cosmic 20
Best reliable sleeping bag for budget conscious backpackers.
Designed for three-season adventures, this mummy-style sleeping bag offers an ideal balance of warmth, comfort, and packability. The high-quality down insulation provides excellent thermal efficiency, ensuring a restful night even when temperatures drop. A durable, water-resistant shell protects against the elements, while the spacious interior allows for natural movement during sleep. Thoughtful design elements, such as a draft collar and an internal stash pocket, enhance convenience and heat retention. Whether embarking on a weekend trek or a longer backcountry excursion, this reliable gear delivers the consistent performance needed for a comfortable outdoor experience in varying conditions.
$169.99
More Cosmic Options
Cosmic 20
$159.95
Cosmic Down 20
$189.95
Cosmic 40
$119.95
Cosmic Synthetic 0 Degree
$139.95
Cosmic Synthetic 20
$109.95
Cosmic 20 Degree Sleeping Bag
$159.95
Cosmic Ultra 20 Degree
$269.95
Cosmic
$314.95
Cosmic 20 Sleeping Bag (Long)
$109.95
Cosmic Synthetic 20 Degree
$119.95
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 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
+2%
Above average
Temperature Rating
20
/ degrees Fahrenheit
Who it's for
- Backpackers seeking a balance of warmth and portability for three-season use.
- Budget-conscious campers and hikers wanting the comfort of down insulation.
- Campers prioritizing comfort and a less constricting feel in their sleeping bag.
Who should skip it
- Winter adventurers needing robust insulation for consistently frigid conditions.
- Experienced trekkers desiring cutting-edge technology and specialized features.
- Ultralight enthusiasts prioritizing minimal pack volume for extended trips.
Performance breakdown
Thermal Efficiency
The 550-fill down provides reliable warmth for most three-season adventures.
Packability
Solid compression for down, though bulkier than premium ultralight alternatives.
Weight-to-Warmth Ratio
An excellent balance for backpackers prioritizing comfort over shaving every ounce.
Interior Comfort
The spacious mummy cut offers plenty of room for natural movement.
Durability
Rugged polyester shell materials withstand the rigors of frequent backcountry use.
Feature Utility
Thoughtful additions like the draft collar significantly improve cold-weather performance.
Key Specs
Temperature Rating
20 degrees Fahrenheit
Insulation Type
550 fill power down
Weight
2.8 lbs
Max User Height
78 inches
Compressed Volume
12.5 liters
Sleeping Bag Shape
Mummy
Shell Material
Polyester
Lining Material
Polyester
Know before you buy
The 20-degree rating indicates the lower limit where the average user should remain comfortable, but it is not a guarantee of warmth. If you are a cold sleeper, you will likely be most comfortable in temperatures closer to 30 or 35 degrees, especially when paired with a quality sleeping pad.
Yes, the Kelty Cosmic 20 uses treated down insulation, which helps it resist moisture better than untreated down. While it performs well in damp conditions, it is still important to keep your bag dry and use a waterproof stuff sack when packing.
When fully compressed, the bag has a volume of 12.5 liters. It is designed to be packable for a 3-season bag, though it will take up a significant portion of a smaller daypack.
Yes, the bag is designed to accommodate users up to 78 inches, or 6 feet 6 inches, in height. If you are near this height, you may find the fit snug, but it provides adequate length for most tall individuals.
The draft collar is an insulated tube that sits around your neck and shoulders to seal in warmth. It prevents the heat generated by your body from escaping out the top of the bag, which is essential for staying warm on nights near the 20-degree limit.
Mummy bags are inherently more tapered than rectangular bags to maximize thermal efficiency, which can feel restrictive to side sleepers or those who toss and turn. However, the Cosmic 20 is cut with a slightly more spacious shape than some performance mummy bags to allow for more natural movement.
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