Kelty Cosmic Synthetic Sleeping Bag
4.3Best price now
$66.73at REIObserved Nov 5, 2026, 6:54 PM
26% under what the other stores charge
Compared across 6 stores. Prices are checked against each store and labelled with when.
26% under what the other stores charge
Compared across 6 stores. Prices are checked against each store and labelled with when.
It checks today's price at every store, compares the alternatives and answers in about a minute.
The Kelty Cosmic Synthetic is a 40°F mummy bag built for three-season backpacking. It uses Kelty's Cirroloft synthetic insulation and a soft nylon taffeta lining, and it weighs about 2 pounds with a stuff sack included. At $66.73 at REI as of November 5, 2026, it sits at the low end of its recent price range, making it one of the cheaper ways into a name-brand synthetic bag.
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In stockSold by Camp ClubReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Availability unknownSold by erpow-50 (100% positive, 89 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
Availability unknownSold by freelollipopcom (99.8% positive, 44,200 ratings)Returns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.
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Lowest price we've seen: $66.73 on Nov 5 at REI. Tracked across 12 stores since Nov 5.
Owners rate the Cosmic Synthetic well overall, at 4.3 out of 5 from 26 ratings. Most praise it as a light, affordable bag for summer trips, while some find the 40°F rating optimistic on chilly nights.
Let’s face it- when is backpacking ever actually easy? While we can’t take the pain out of your elevation gain, we can put you on the trail with the new Cosmic Synthetic sleeping bag. It’s a fully equipped mummy bag that’s light on weight and your wallet. The Cosmic Synthetic is a three-season superstar built with our new Cirroloft Synthetic Insulation for lightweight, compressible warmth. Soft-as-silk nylon taffeta fabric means you’ll be thinking less about weary hiker feet and daydreaming about more QT in the outdoors.
