Kelty

Cosmic Ultra 20

Kelty Cosmic Ultra 20

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Overall

#11 in

Outdoor Sleeping Bags

according to Reddit Icon Reddit

Sentiment score69% positive
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Top Pros

Top Cons

No summary available.

Last updated: Jun 30, 2026

Reddit Reviews

Reddit Iconflobbley
4 months ago

If you can fit into a women's size bag consider the Cosmic Ultra, it's basically the same thing as the regular cosmic down but with better quality down. https://a.co/d/01ERuBBU If you actually need a 15 degree (limit) bag I can't recommend the Mobile Mummy 15 enough. I love this bag. It's currently out of stock but it comes and goes from this website. https://www.kaviso.com/products/sierra-designs-mobile-mummy-15-degree?variant=45495009935588

Reddit IconJNyogigamer
9 months ago

I bought 2 sleeping bags this year. I'm just not a quilt person. However my summer bag (37°), bought a Chinese brand Qezer on Amazon under $100. My winter down bag Kelty Ultra Cosmic 20 also on Amazon for under $160. Now I'm not suggesting these are the best or necessarily for you, but I'm satisfied with both of them and don't feel that they broke the bank. However, they are both made of down, significantly lighter than synthetic, and pack down to a reasonable size for my pack.

3 months ago

Well I don't have experience with the katabatic and haven't touched one. But I did research them and the strap system was the selling point for me along with the cost all other things comparable. I feel like the quality is great. Like I said zero buyers remorse. I was coming from a Kelty Cosmic Ultra 20 mummy bag which I felt underperformed this winter. I shaved almost a pound of gear weight and at 30 degrees F (the coldest I've had the waratah out in so far) I was much warmer than I've experienced being in the Kelty, which I would have had to pair with a fleece liner at that temperature.

9 months ago

You're likely to get all kinds of different advice, but the Kelty is a solid budget bag I think. They also have a Kelty Ultra Cosmic 20 that is 800 fill down and it packs down smaller than the regular Cosmic 20, and it's also under $200.

9 months ago

You're likely to get all kinds of different advice, but the Kelty is a solid budget bag I think. They also have a Kelty Ultra Cosmic 20 that is 800 fill down and it packs down smaller than the regular Cosmic 20, and it's also under $200.

Reddit IconDuckin_Tundra
12 months ago

Kelly cosmic down 20f, not under 80$ tho, if your short you can get the women’s one at backcountry for like 110$.

Reddit Iconkrzybone
about 1 month ago

Usually any self inflating sleeping pad gets the job done. Alps mountaineering outback sleeping pad is the one I use for camping. As for sleeping bags Kelty is always your best budget sleeping bags.i use a 20 down sleeping bag.

Reddit IconMuted_Past1101
8 months ago

I’ve had the Comic 20 for about a year now and it’s the warmest sleeping bag I’ve ever had. I would recommend a different bag if the lowest temp you’re going to be in is in the 40s cause you’ll be roasting! It really is a good bag though.

8 months ago

I’ve used it in single digits before. One night was around 5 degrees Fahrenheit and I was warm in just my most base layer.

Reddit IconagileTrees
6 months ago

I’ve been on two trips including Colorado/Collegiate peaks with that sleeping pad and it’s been fine for me so far! We went in early July. I would swap the sleeping bag for a down one that will pack smaller. I used the Kelty Cosmic 20 Down. If I had one more layer I would’ve been perfect but it did get a little chilly at night. I would also swap the sawyer for a life straw. Flow rate is much better and it’s built into the bag. That seems a little expensive for fuel so you might pick that up at REI locally.

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