Kelty
Cosmic 20 Sleeping Bag
Best versatile down bag for budget conscious backpackers.
Designed for shoulder-season adventures, this sleeping bag balances warmth and packability for reliable comfort from early spring through late autumn. The mummy silhouette maximizes thermal efficiency, while the specialized baffle construction ensures consistent heat retention throughout the night. A water-resistant finish provides peace of mind against light moisture, and the spacious foot box allows for natural movement during sleep. With thoughtful additions like an internal stash pocket and an anti-snag zipper draft tube, it offers a practical, dependable solution for backpackers and weekend campers seeking a comfortable night of rest in variable conditions.
$118.22
More Cosmic Options
Cosmic 20
$159.95
Cosmic Down 20
$189.95
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 40
$119.95
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
-29%
Below average
Shell Material
204000
/ D T nylon with PFC-free C DWR finish
Who it's for
- Budget-conscious backpackers seeking reliable warmth without a premium price tag
- Campers frequently facing humid environments or morning condensation
- Side sleepers and restless campers who value interior movement
Who should skip it
- Ounce-counting thru-hikers prioritizing the lightest possible pack weight
- Cold sleepers planning to camp in true sub-freezing conditions
- Backpackers with limited internal pack volume needing maximum compression
Performance breakdown
Thermal efficiency
Mummy silhouette and baffle construction trap heat effectively for shoulder-season nights.
Packability
550-fill down compresses well, though heavier than premium ultralight alternatives.
Moisture resistance
PFC-free DWR finish handles light condensation but struggles in sustained dampness.
Foot box comfort
Spacious design allows for natural foot placement without restricting movement.
Zipper reliability
Anti-snag draft tube design minimizes frustration during late-night exits.
Weight-to-warmth ratio
Solid performance for weekend campers, though not built for fast-and-light trekking.
Key Specs
Shell Material
20D 400T nylon with PFC-free C0 DWR finish
Lining Material
50D 300T polyester
Insulation Type
550-fill duck down
Sleeping Bag Shape
Mummy
Temperature Rating
20 degrees Fahrenheit
Weight
3.94 lbs
Max User Height
68 inches
Zipper Location
Right
Know before you buy
The Cosmic 20 is rated for 20 degrees Fahrenheit, making it an ideal choice for shoulder-season camping. It provides reliable warmth from early spring through late autumn, though you may want a liner if you plan to sleep in temperatures consistently near its limit.
The bag uses 550-fill duck down, which is excellent for warmth and packability. While the shell features a water-resistant finish to repel light precipitation, down can lose its loft when wet, so it is best to keep the bag dry inside your pack or tent.
The mummy silhouette is designed to maximize thermal efficiency by keeping the insulation closer to your body. To ensure you don't feel restricted, this model includes a spacious foot box that allows for more natural movement while you sleep.
The bag is equipped with an anti-snag zipper draft tube. This feature is specifically designed to prevent the zipper from catching on the lining while simultaneously sealing in heat.
This specific model is designed for users up to 68 inches, or 5 feet 8 inches, in height. If you are taller than this, you may find the fit too restrictive.
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Ready to buy?
$118