How to Choose Sleeping Bags for Backpacking
REI Co-op Radiant 20 Sleeping Bag
$199.00
Members get an est. $19.90 in rewards
Cool-weather backpacking? The REI Co-op Radiant 20 sleeping bag has zonal insulation to keep you warm, plus ample space for toss-and-turn comfort. Nine different sizes help you find the perfect fit.
Key Details
Fill
600-fill-power down (bluesign approved); draft collar, draft tube & footbox panel: recycled PET polyester
Weight
Short Narrow: 2 lbs. 4.5 oz.
Short: 2 lbs. 7 oz.
Short Wide: 2 lbs. 9 oz.
Medium Narrow: 2 lbs. 8 oz.
Medium: 2 lbs. 11 oz.
Medium Wide: 2 lbs. 12 oz.
Long Narrow: 2 lbs. 8 oz.
Long: 2 lbs. 14 oz.
Long Wide: 3 lbs.
Compressed Volume
Short Narrow: 5.5 liters
Short: 5.9 liters
Short Wide: 6.4 liters
Medium Narrow: 6 liters
Medium: 6.7 liters
Medium Wide: 7 liters
Long Narrow: 6.7 liters
Long: 7.4 liters
Long Wide: 7.6 liters
Temperature Rating (F)
19 degrees (F)
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- Inclusive sizing lets you find your best fit based on body shape and sleeping preferences
- Semifitted shape provides the roomiest fit of our backpacking bags, with extra knee room to accommodate a variety of sleeping positions
- 600-fill-power down provides excellent loft, lightweight warmth and compresses small
- Strategically placed synthetic insulation in the footbox provides additional protection against tent wall dampness
- Nonfluorinated durable water repellent (DWR) finish on the shell and lining helps moisture bead up on the surface
- Contoured hood pattern fits more naturally to your head and accommodates most backpacking pillows
- Draft tube, draft collar and face muffler keep warmth in and cold out
- Trapezoidal footbox provides foot comfort
- Zipper cover and internal antisnag strip combine for easy zipping
- Differentiated drawcords let you adjust hood and neck easily in the dark
- Interior stash pocket for storing small, quick-access items
- Includes a nylon stuff sack for packing and a roomy mesh bag for breathable storage
- Hand-wash or machine wash warm, gentle cycle in front-load washer only; do not bleach; rinse thoroughly; do not wring; air dry or tumble dry low; do not iron or dry clean
- This product contains RDS-certified down certified by Bureau Veritas TE-00104632
- The purchase of Responsible Down Standard (RDS) certified products demonstrates demand for animal welfare practices in the down and feather supply chain
- REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world
- Contains materials that meet the bluesign® criteria
Imported.
Temperature ratings are intended as a guideline to help you compare products, rather than a guarantee of warmth, since many different factors contribute to your comfort while you sleep. Our backpacking bags are rated for temperature according to an independent testing protocol: International Organization for Standardization (ISO) 23537. Testing is based on a person wearing one base layer and a pair of socks, sleeping on an insulated surface with a minimum R-value of 5.38.
Each bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. For REI Co-op brand nongendered sleeping bags, we provide an overall temperature rating that falls between the Comfort and Lower Limit ratings.
View all REI Co-op Backpacking Sleeping BagsEach bag then gets 2 ratings: the Comfort rating is the lowest temperature at which the bag will keep the average "cold sleeper" comfortable, and the Lower Limit rating is the lowest temperature at which the bag will keep the average "warm sleeper" comfortable. For REI Co-op brand nongendered sleeping bags, we provide an overall temperature rating that falls between the Comfort and Lower Limit ratings.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 13 degrees (F) - ISO |
| Tested Comfort | 25 degrees (F) - ISO |
| Temperature Rating (F) | 19 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Weight | Short Narrow: 2 lbs. 4.5 oz. Short: 2 lbs. 7 oz. Short Wide: 2 lbs. 9 oz. Medium Narrow: 2 lbs. 8 oz. Medium: 2 lbs. 11 oz. Medium Wide: 2 lbs. 12 oz. Long Narrow: 2 lbs. 8 oz. Long: 2 lbs. 14 oz. Long Wide: 3 lbs. |
| Shell | Recycled polyester (bluesign approved) |
| Zipper Location | Left |
| Insulation Type | Down / Synthetic Blend |
| Fill | 600-fill-power down (bluesign approved); draft collar, draft tube & footbox panel: recycled PET polyester |
| Fill Weight | Short Narrow: 1 lb. 5.4 oz. Short: 1 lb. 6.9 oz. Short Wide: 1 lb. 8.2 oz. Medium Narrow: 1 lb. 7.5 oz. Medium: 1 lb. 9.4 oz. Medium Wide: 1 lb. 10.7 oz. Long Narrow: 1 lb. 9.5 oz. Long: 1 lb. 11.1 oz. Long Wide: 1 lb. 12.6 oz. |
| Sleeping Capacity | 1-person |
| Lining | Recycled polyester (bluesign approved) |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Short Narrow: 65 inches Short: 65 inches Short Wide: 65 inches Medium Narrow: 71 inches Medium: 71 inches Medium Wide: 71 inches Long Narrow: 77 inches Long: 77 inches Long Wide: 77 inches |
| Shoulder Girth (in.) | Short Narrow: 58 inches Short: 65.5 inches Short Wide: 73 inches Medium Narrow: 59 inches Medium: 66.5 inches Medium Wide: 74 inches Long Narrow: 60 inches Long: 67.5 inches Long Wide: 75 inches |
| Hip Girth (in.) | Short Narrow: 48.5 inches Short: 56 inches Short Wide: 64.5 inches Medium Narrow: 49.5 inches Medium: 57 inches Medium Wide: 65.5 inches Long Narrow: 50.5 inches Long: 58 inches Long Wide: 66.5 inches |
| Stuff Sack Size | Short Narrow: 7 x 11.75 inches Short: 7 x 11.75 inches Short Wide: 7 x 11.75 inches Medium Narrow: 7 x 11.75 inches Medium: 8.5 x 13 inches Medium Wide: 8.5 x 13 inches Long Narrow: 8.5 x 13 inches Long: 8.5 x 13 inches Long Wide: 8.5 x 13 inches |
| Stuff Sack Volume | Short Narrow: 7.5 liters Short: 7.5 liters Short Wide: 7.5 liters Medium Narrow: 7.5 liters Medium: 10 liters Medium Wide: 10 liters Long Narrow: 10 liters Long: 10 liters Long Wide: 10 liters |
| Compressed Volume | Short Narrow: 5.5 liters Short: 5.9 liters Short Wide: 6.4 liters Medium Narrow: 6 liters Medium: 6.7 liters Medium Wide: 7 liters Long Narrow: 6.7 liters Long: 7.4 liters Long Wide: 7.6 liters |
| Gender | Unisex |
| Sustainability | Contains recycled materials Contains materials that meet the bluesign® criteria From a Climate Label Certified brand |
Buying Advice
Better gear is built together
From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.
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Customer Images
shoe wearer
Received free product
Wisconsin
Great size options!
4 months ago
The thing I enjoyed most about this sleeping bag is its many sizing options. I tend to sleep on my side and many mummy style bags I have tried do not work very well for that as I toss and turn at night. Being able to get this in a wide option is great and I can easily adjust myself at night. Quality is good and what you’d expect from REI. The only complaint I have is the stuff sack is a little small and doesn’t have compression straps.
Age:35–44
Weight:175–200 lbs.
Height:5'9"
Yes , I recommend this product
bschwa253
Received free product
Tacoma WA
Impressive!
4 months ago
I received this product for free from REI in exchange for my honest review. This is a great sleeping bag. I have been using the same sleeping bag for well over a decade of backpacking trips, and I was really impressed with some of the features, as well as the overall warmth of this bag! Features: This bag has a nice little flap of insulation up by the neck area, which helps to lock in your body heat and keeps you warm inside. There's also a really nice stash pocket near the hood which is perfect for stashing any small items you might need in the middle of the night. Packability: It packs fairly small, definitely suitable for backpacking. The included stuff sack doesn't have any compression straps, but upgrading to a better quality stuff sack could likely free up some room inside your pack. Warmth: I haven't tested this bag in weather colder than 40 degrees yet, but it was plenty cozy at that temperature. Much warmer than my old beat up sleeping bag. Downsides: The only problem with this sleeping bag is that my wife is probably going to steal it from me and I'll be back in my old bag by mid-summer.
Age:35–44
Yes , I recommend this product
Yuri
Received free product
Seattle, WA
Soft, Light and Fluffy Sleeping Bag
5 months ago
This amazing light weight sleeping bag is incredibly soft, so very light and fluffy! It is easy to carry on any camping trip, backpacking or even in a tent in your backyard in the winter snow! When I used this sleeping bag, it was like sleeping on feathers and having a down comforter wrapped all around you while keeping you extra warm. It is a bed and blanket all wrapped up into one item!
Age:35–44
Weight:100–125 lbs.
Height:5'0"
Yes , I recommend this product
Zeb778
Received free product
Califorina
Good bag to own
5 months ago
I really liked this bag. Comfortable and warm. Zippers looked good. That's usually my complaint with sleeping bags. Six feet 2 inches and 200 lb was very comfortable. Nive simple color combo. Not to hard to pack away in the stuff sack.
Age:35–44
Weight:200–225 lbs.
Height:6'2"
Yes , I recommend this product
JulieInDC
Received free product
Washington DC
Comfy sleeping bag for camping
4 months ago
My goal with this bag was to get something for super cold camping trips that had some room to it. Just when I wanted to try it, we hit spring so the super cold checks will have to wait. It definitely kept me comfortable overnight at 35F and the extra space (I got the wide version) is much more comfortable than a traditional mummy bag. The extra flap at the collar (to go around your neck when cinched down) and the ability to cinch the top and lower part of the collar separately make me think it'll handle much colder nights. I appreciate that those two cords on the collar are different colors and types (one is round, one is flat), which is a nice touch to be able to adjust them in the dark. I struggled a bit to loosen them on my own though, was definitely a two handed operation. The interior pocket fits a cell phone easily and keeps the battery from draining in the cold, I didn't love having it on top of my chest while I slept though, so I mostly just let it bounce around as I slept.
Age:35–44
Weight:125–150 lbs.
Height:5'3"
Yes , I recommend this product
Irnbru72
Received free product
Salem, MA
Solid lightweight sleeping bag
4 months ago
The REI Co-op Radiant 20 is a warm, lightweight, and durable three-season sleeping bag with water-resistant down, a roomy fit, and great packability—ideal for backpackers seeking comfort and reliability.
Age:45–54
Weight:225–250 lbs.
Height:6'4"
Yes , I recommend this product
LakeLover234
Received free product
Michigan
Depends on who is using it, but otherwise good
4 months ago
The long is good for extra leg room but still kinda tight depending on who is using it. I am 130 lbs, 5’3” and my husband is 260 lbs, 6’1”, I had plenty of room to move around in the sleeping bag but my husband said it was snug. He had to sleep with his arms resting on his chest instead of his sides because of how tight it felt. I could wear several layers and bring in a thin blanket, my husband was able to wear a thick hoodie but not have a blanket in there with him. Otherwise it was very warm and accumulated heat quickly, we camped in the spring, got down into the 20’s (F) at night and was plenty warm enough. The bag is rated to 13 F, but we don’t typically camp during the colder months - so it was perfect for our use. The bag has loops on the side by the zipper that looks like you can hang it by if it gets wet or for storage. The zipper has a plastic guard on it to keep the bag from getting caught, however when my husband was using it the side of the bag was still getting caught on the zipper when he was inside. When I used it, it was easier to zip but I’m also smaller and had more room to move in the bag - again because it was very snug (husband shoulder width is 21-22”)The material is pretty standard, it’s light weight but thin. I would say it’s a good sleeping bag for our use in the spring and fall. Might be too warm for summer nights.
Age:25–34
Weight:125–150 lbs.
Height:5'3"
Yes , I recommend this product
Mountain man
Received free product
Tacoma Washington
Lightweight sleeping bag
4 months ago
I took the rei co-op radiant 20 sleeping bag to do some car camping along the Columbia gorge in Oregon, one of my immediate first impressions was how light weight it felt and how I’ll be using this as my go to sleeping bag for back packing from now on. The color scheme with the orange and the grey pairs well together but I definitely lean towards darker colors, I few more color options would be nice! I really like how sturdy the zipper feels, it feels well made and that it will last for sometime, also with the zipper I like that there is a long string like grip for easy handling with opening up the sleeping bag. As for the length of the sleeping bag it fits like a glove although it would be nice with just a little extra length, me being 5’9 and with a slim size it felt a little more roam would be better, so if your taller than that the length might be to tight. I’ll have to say that the sleeping bag is quite comfortable though, the material is pretty cozy and kept me warm through the night, I’m not sure exactly what the temperature was outside but it was probably around 30 degrees. All and all I think it is a decent sleeping bag and I’ll definitely be using it quite a bit.
Age:25–34
Weight:150–175 lbs.
Height:5'9"
Yes , I recommend this product
flyingember
Received free product
Super Flexibile Option
5 months ago
I picked up this bag in exchange for a review. It gets a five stars because of what they do right rather than what they do badly. I was thinking about getting a new sleeping bag for my youngest kid to grow into for Scout camping, it will work well for that. We have a variety of bags in a variety of brands from cheap felt liners to custom sleeping quilts so I can come from comparing it with all of them I’m very happy with it given its features. Having three widths and three lengths is a great thing to see. Unlike many bags they give the weight of every bag size, a massive positive. Having this many options is something often limited to custom made bags that cost a lot more. That alone will have me recommending it to others. Unused space is cold space. I have a few areas of concern- The lack of actual r-value shared. The mesh storage bag is nice. I’ve had to buy them for other bags, its inclusion is welcomed. The stuff sack is a bit too small. It goes in but it takes a lot of effort, something hard to do in the cold. You may find yourself replacing the bag or just not using it. Make note this is down, the direction to clean it doesn’t account for that. REI has a great down care article they could link to. It is not quite designed for draft control. The bottom zipper hole isn’t insulated that well. Easy to fix with a spare sock but something to know about. What’s the tiny loop for? There’s nothing about it in the description.
Yes , I recommend this product
coloring
★☆☆☆☆ Disappointed – Missing Essential Packing Bag
2 months ago
I bought this sleeping bag online and was really disappointed when it arrived. It was shipped flat without the smaller compression/stuff sack that’s supposed to come with it. That little bag is essential for traveling or packing it in a suitcase — without it, the sleeping bag is way too bulky to bring on a plane. It’s ridiculous that such an important part is missing, and there was no warning or option to request a replacement. Now I’m stuck with a sleeping bag I can’t even use for my trip. Tip: Buy this in-store where you can actually see what you’re getting. Ordering online clearly isn’t reliable — I won’t be making that mistake again.
No, I do not recommend this product
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