How to Choose Sleeping Bags for Backpacking

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Sleep snug and sound on subfreezing fall nights in the men's Kelty Cosmic 20 sleeping bag. It features soft-as-silk nylon taffeta fabric and a handy stash pocket for your headlamp.
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| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 19 degrees (F) - ISO |
| Tested Comfort | 30 degrees (F) - ISO |
| Temperature Rating (F) | 19 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Shell | 20-denier nylon taffeta |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 600-fill-power DriDown |
| Fill Weight | Unavailable |
| Lining | 50-denier polyester taffeta |
| Sleeping Bag Shape | Mummy |
| Compressed Volume | Unavailable |
| Gender | Men's |
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I purchased this for my first camping trip in nearly 30 years. We went on a 4 day kayak camping trip to lake Umbagog in northern NH where it got into the mid 30's at night. I did not want to be cold. I was quite comfortable all night... if anything, I was warm since I was wearing a long leg / sleeve base layer and using a bag liner. Did I mention that I did not want to be cold? I could have foregone the liner and long johns and been perfectly comfortable all night. I bought the "long" version which was the perfect height... no pulling at the bottom or top. It's a reasonable weight to performance ratio and is easy on the wallet.
I really wanted the "Never Summer" but after comparing the two, this one packs sooooo much smaller, and is extremely comfortable! I love the fit, the outside pocket to keep my iPhone in, and the way it will pack sooooo small. I use a compression sack that it barely just fits in, then compress it, and slip "that" into an all-weather sack to protect it from the elements. I plastic bag around that before going into the all-weather protection sack ensures that it won't get wet! I'd buy it again!
An excellent bag for the price. It's 80/20 down/nylon fill is an upgrade. The complants are understandable, but the nylon is in the bags bottom baffles where down gets compressed and loses insulation. The 80/20 fill also shaves off weight. Numerous new down bags are going the same route by putting more down on the top of the bag, expecting the sleeping pad to insulate your body on the bag's bottom. If you are a beginner backpacker, or if you want to save money but get the comfort and compressability of down, this is the bag.
I have used this sleeping bag on several AT section hikes/backpacking trips and Pisgah NF/wilderness trips. The temperature rating is accurate. If you're an ultralight fanatic this bag won't be for you, but I'll carry the extra pound and save a couple of hundred $$$. Highly satisfied!
I love this sleeping bag! It super comfortable and very quick to set out. It retains heat very well, and offers moderate ventilation. There is a fine line between comfortable and starting to sweat, so prepare to lose layers if its above 40 degrees. I took this on the Art Loeb Trail in August and worked very well! The zipper does snag, but it doesn't get stuck. The footbox has a good amount of space and I even had room to sleep on my side. P.S. The bag does not come with a compression sac, but it fits like a glove in a Sea to Summit Medium (14L) dry compression sac.
Love this! I’m a 5’5” woman who needs lots of space to move around when I sleep, so this totally fits the bill. I thought it might be too cool, but so far it’s been perfectly warm.
First of all: this is a good sleeping bag. It does what it needs to do. However, there are a few small quirks about it that I feel you need to be aware of before you buy it. 1. Although the down and liner material itself is comfortable, the stitching on this bag uses a slightly stiffer thread that raises a ridge, which can be a little annoying against bare skin (i.e. if you're wearing shorts and t-shirt to sleep in). I can see this becoming a pet peeve if I had to sleep in this bag for weeks on end. 2. The drawstring closure on the hood uses a rather thin cord without a lot of stretch to it. The upper part of the drawstring is covered by the hood, but the lower part relies on the draft collar to stop the string from rubbing against your face in an irritating manner when closed up. 3. When you consider the cost (which is outstanding compared to the competition!), keep in mind that this sleeping bag does not include a compressing stuff sack or a long-term storage sack. A proper compression stuff sack and a long-term storage sack cost 20 dollars each, so add that into the cost if you're the type that needs those thing. Given the type of camping I do, the included stuff sack is fine, and I'm using a heavy-duty trash bag for long-term storage for now. Conclusion: Good sleeping bag with a few downsides. I'd definitely upgrade if I were going to be doing longer trips, but as a mostly weekend camper who does some light walk-ins and the occasional three-to-four night hike-in, it's fine.
This was my first nice sleeping bag I’ve owned and came as a recommendation from a friend. I took it out on a night that got into the mid 30s and felt super warm. I paired it with the stratus sleeping pad from REI and it was great! No issues. I am a warm sleeper so that may sway my bias a little. I got this since I think I will want to venture into backpacking and it’s light enough to use. The outer lining is softer than the inner which I don’t understand but it’s not a huge issue. Overall really warm and comfortable bag!
The fill is 80% Down and 20% Poly fill, it doesn't feel like a down bag, and it doesn't compress like a down bag. This is mentioned nowhere in the description, I ended up buying another bag that was actually down fill. I will be returning this bag. If the listing accurately described the product it would probably get more stars. I'm only rating it low because i expected a down bag.
This sleeping bag is really comfortable and reasonably warm. Plenty warm for me, that is. If some one needs more warmth, it would easily double with another sleeping bag. Or, one could use with a blanket easily It packs very small and light. I use compression sack, and it is smaller than a soccer ball.