Kelty Cosmic Ultra 20F
Rating
Versatility: 9
Size/Weight: 7
Features: 7
Construction: 7
Sleep Quality: 8
OVERALL: 7.6
Top pick for bang-for-your-buck quality.
The Kelty Cosmic Ultra 20F hits the sweet spot between warmth, weight, comfort and affordability. While it's a mummy-style bag, the roomier foot area gives you space to move, the zippers work smoothly and the inner pocket sits right where you need it.
Best For: Backcountry trips, cold-weather camping
Pros: Cozy, toasty, sheds moisture well, and easier on the wallet than most
Cons: Could use a better compression sack - it takes up more pack space than some competitors
Verdict: A reliable performer that won't break the bank
Skip ahead to First Impressions, Sleeping Experience, Features Analysis, Construction and Durability, or the Final Verdict, check out how the Kelty Cosmic Ultra 20F compares to others in our list of the Top 5 Sleeping Bags, or see how we choose the best sleeping bag.
Specs:
Packed Size: 13x8in
Weight: 2.35lbs
Fill: 800-Fill DriDown
Approx Price: $175.96
First Impressions
This lightweight mummy bag surprised us with its comfort, especially considering the snug foot area.
The Kelty combines a classic mummy shape with well-placed pockets, water-resistant 800-Fill DriDown insulation and special trapezoidal baffles that boost warmth. For a 3-season bag at this price point, it delivers impressive performance.
Sleeping Experience
The Cosmic Ultra 20F lives up to its high comfort rating, thanks to its down-polyester blend insulation. We stayed warm throughout the night and could move around easily despite the mummy cut (the wider footbox helps here).
The contoured hood provided excellent head support and warmth, sealing in heat without feeling restrictive. The smooth-running zipper with its insulated draft tube worked perfectly.
Our only gripe? We wish it came with a compression sack to pack down smaller.
Features Analysis
Kelty packed smart features into this bag. The 800-fill DriDown keeps you warm while resisting moisture, which is great for humid conditions.
Handy touches include an internal zippered pocket for essentials and that reliable anti-snag zipper system. While functional, the storage sack could be more compact for backpackers watching their pack space.
Construction and Durability
The 20D nylon fabric feels soft yet durable against your skin, while the specially treated DriDown maintains its loft even when damp.
The roomy footbox adds comfort, though we noticed the down insulation might shift toward the baffle edges with use. Fluffing the bag occasionally and proper washing will help maintain even warmth distribution.
Final Verdict
We can't stress this enough: it's seriously comfortable!
A dependable cold-weather option packed with quality details, from the water-resistant down to the comfortable fit. If you can overlook the slightly bulky packed size, you're getting a great night's sleep without breaking the bank.
Why not visit our list of the Top 5 Sleeping Bags of 2025 to see how the Kelty Cosmic Ultra 20F compares?
Water & Outdoors reviews are written by our staff writers, who combined have over fifty years of experience on the water and outdoors. We may earn commissions if you choose to buy through a link you’ve clicked on our website, however this does not influence our reviews. For more information, please see our Editorial Policies.