Kelty
Kelty Cosmic Synthetic 0 Degree Sleeping Bag
Best affordable winter sleeping bag for budget conscious car campers.
Stay warm and comfortable during cold-weather excursions with this reliable synthetic sleeping bag. Designed for three-season versatility, it offers a practical, low-maintenance alternative to down without sacrificing performance. The construction features fully recycled fabrics and insulation, ensuring environmental responsibility alongside durability. An offset quilt design effectively eliminates cold spots, while the insulated draft collar and full-length draft tube work together to lock in heat. With a spacious, natural-fit footbox that allows for comfortable toe movement and a convenient internal stash pocket for essentials, this bag provides a cozy, highly compressible solution for restful nights under the stars.
$166.00
More Cosmic Options
Cosmic 20
$159.95
Cosmic Down 20
$189.95
Cosmic Synthetic 0 Degree
$139.95
Cosmic
$314.95
Cosmic 20 Sleeping Bag (Long)
$109.95
Cosmic Synthetic 20 Degree
$119.95
Cosmic 40
$119.95
Cosmic Synthetic 20
$109.95
Cosmic Ultra 20 Degree
$269.95
Cosmic 20 Degree Sleeping Bag
$169.99
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 Down 20
$189.95
Kelty Cosmic Ultra 0
$369.95
Cosmic Synthetic 40 Degree
$99.95
Cosmic Synthetic 20
$109.95
Owner Satisfaction
4.3
/ 5
Category Rank
1800
/ 2020
#1800 in Sleeping Bags
Price vs Category Average
-42%
Below average
Temperature Rating
0
/ °F
Who it's for
- Value-conscious campers needing reliable warmth on a strict budget
- Backpackers frequently camping in humid or wet environments
- Cold-weather sleepers who appreciate small functional design details
Who should skip it
- Minimalist hikers with limited space in their gear kits
- Ultralight backpackers prioritizing a low base weight for long miles
- Sleepers who run cold and expect true zero-degree comfort
Key Specs
Temperature Rating
0°F
Sleeping Bag Shape
Mummy
Insulation Type
Synthetic
Weight
4.75 lbs
Shell Material
Recycled 20D Nylon Taffeta
Lining Material
Recycled 50D Polyester Taffeta
Water Resistant
Yes
Season Rating
3-Season
Know before you buy
Yes, it is rated for 0°F, making it suitable for cold-weather camping. The offset quilt construction and insulated draft collar are specifically designed to trap heat and eliminate cold spots, though your personal warmth preference and sleeping pad insulation will also play a role.
The bag weighs between 4.75 and 5.19 lbs depending on the size. While it is not an ultralight backpacking option, it is highly compressible and comes with a compression stuff sack to help you pack it down efficiently for your trip.
Kelty designed this bag with an expanded, roomy footbox to allow for natural toe movement, which helps alleviate the cramped feeling common in traditional mummy bags. However, if you are a very active sleeper who needs a lot of room to roll, you may still find the mummy shape more restrictive than a rectangular bag.
The recycled Cirroloft Eco synthetic insulation performs better than down when damp, meaning it will retain its loft and warmth even if it gets wet. It is a more durable and affordable option, though it is heavier and bulkier to pack than a comparable down bag.
The bag features an anti-snag zipper treatment specifically engineered to prevent the fabric from catching in the zipper track. This ensures smooth operation when you need to get in or out of the bag quickly in the dark.
Yes, there is a convenient internal zippered stash pocket located inside the bag. It is designed to keep small essentials like your phone, keys, or a headlamp secure and warm, preventing your battery from draining in the cold.
Still have a question?
Ask Hayley anything about this product before you decide.