How to Choose Sleeping Bags for Backpacking
REI Co-op Radiant Down Sleeping Bag
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Take the REI Radiant down sleeping bag on all of your 3-season adventures. It's designed for the backpacker who prioritizes comfort over weight and wants a balance of performance and price.
Shop similar productsKey Details
Fill
650-fill duck down
Temperature Rating (F)
20 degrees (F)
- High-quality 650-fill-power duck down is warm, lightweight and compressible; bag has a temperature rating of 20°F
- Relaxed fit from the shoulders to the hips increases comfort by providing ample space to move around
- Exclusive REI Down Fill Calculator optimizes the amount of down per baffle for the most warmth with the least amount of down
- Baffle spacing allows the down to remain fully lofted and keeps it from shifting, preventing cold spots
- Ripstop nylon shell resists water and abrasion; smooth polyester taffeta lining is comfortable against your skin
- Shell fabric is treated with a Durable Water Repellent finish to repel moisture and stains
- Contoured hood, insulated full-face muffler and full-length draft tube with ground-level seams keep body heat in and cold air out
- The REI Radiant down sleeping bag has an external chest pocket that stows your watch, glasses or other small essentials
- Differentiated drawcords (1 round, 1 flat) let you adjust hood and neck easily in the dark
- Full-length of zipper is backed by wide, antisnag binding tape
- Any REI backpacking bag can be zipped to any other REI backpacking bag because of the consistent 63 in., No. 5, YKK zipper; women's bags zip on the right, men's on the left
- Pad loops provide attachment points to keep your sleeping bag and pad together to avoid rolling off onto the cold ground (straps and sleeping pad sold separately)
- Includes stuff sack and storage bag
- European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
- 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
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 | 20 degrees (F) - EN |
| Tested Comfort | 32 degrees (F) - EN |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -7 degrees Celsius |
| Shell | Ripstop nylon |
| Insulation Type | Down |
| Fill | 650-fill duck down |
| Lining | Polyester taffeta |
| Sleeping Bag Shape | Mummy |
| Gender | Unisex |
| Sustainability | 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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Kyle the adventure enthusiast
Anchorage, AK
Very impressive.
12 years ago
I used this bag last night, 4-12-13. The temperature dropped to about -3 and this bag kept me very reasonably warm; I slept great! The adjustable hood makes a huge difference. I was using the REI stratus sleeping pad which helped insulate from the cold, snow packed ground. I believe that this bag used in conjunction with accessories like a good insulated sleeping pad and perhaps a liner, make it a great winter bag. I have also used this bag during the summer, up here in AK our summers tend to be in the 50-60's at night, and the bag works great for those nights too. If you are looking for a comfortable, versatile bag with out braking your bank....look no further. This said I am a huge fan of most the REI branded items. I find them to be practical, reasonably priced, and researched to include features that consumers look for. Thank You REI for being great at what you do.
Yes , I recommend this product
Ryles
Atlanta, GA
Roomy Mummy
12 years ago
I bought the long wide version of this bag and it is extremely roomy. I'm not a big guy at 5'9 and 180 but I like to have room in my sleeping bags. This one has plenty of room and is still very light. I'm not sure how cold it is good for as I typically sleep in a hammock. I did sleep warm with a thermorest pro in my hammock in the low 30's so I'd say the 20 degree rating in a tent would be reasonable. I wish they made a 40 degree version for the warmer months. The only con I have is that the zipper can be a little troublesome but that gets compounded when dealing with zipping into a mummy in a hammock.
Yes , I recommend this product
Leaf in the wind
NE Tennessee
Perfect for me
12 years ago
Use it for weekend hikes on the AT in NE TN. Packs down small enough to fit my 40L pack with plenty of room left for puffy jacket and 2 days of food. Toasty warm down to the mid 20's with only one layer on. If you're cold in this bag, you need a better pad. I'm a full size 6'1" and the long version of the bag has plenty of room for me to toss and turn in the night. Considered warmer bags but not willing to go to a larger pack. If I need warmer, I'll keep a 2nd layer on or use a liner. Quality is excellent.
Yes , I recommend this product
DangerDangerDanger
Washougal, WA
I am so happy I got this bag!!!
12 years ago
I am 6'4", 280 pounds. I have a 55" inch measurement around my shoulders and chest, so it is hard to find a good down bag that I can not only fit in, but feel comfortable and not squeezed into without spending 3 or 4 hundred dollars. I bought this bag with a 20% discount coupon I got by email from REI GearMail. There was a platform at the Clackamas store that is perfect for trying on a sleeping for size. I tried a few bags that claimed they had measurements much wider than my shoulders, but they just didn't have enough room for me to roll onto my side with binding and feeling too small. I was a little doubtful about it, tried it out and mulled it over in my head for a half an hour in the store, but I am very glad I decided to get it! My first use of this bag was for some backyard stargazing on a chilly spring night. I always set up for a nights sleep outdoors when I stargaze in case I fall asleep. As I was looking around, I noticed that a thick marine layer of clouds was oozing across the sky. I recalled that the shell of the bag was treated with a DWR, so I was not very concerned about it. I ended up falling asleep as the clouds blocked the sky, I was just so warm and cozy in this bag. I drifted off to sleep feeling very pleased that I finally had a nice warm, comfortable bag. When I woke up the next morning a little before sunrise, I saw that there was a nice fog all around me. I worried that the bag would be wet, but the DWR treatment did it's job. I was dry, and warm. I checked my local weather station and saw that the temperature had gone down to 40 degrees overnight. In the past with some of the other bags I have tried, I would have been a little chilled and a little damp, but not with this bag. I was still warm, comfortable, and HAPPY! I used some 3/4" wide straps through the loops provided on the bag to stay on my pad. I learned that they do not need to be tight to keep me on the pad, and if tight it pulls the bag down and takes away some of the room inside the bag. I loosened the straps and had all the room I needed inside.
Yes , I recommend this product
Will in Tennessee
Birmingham, AL
Great Value and Performance
12 years ago
I recently purchased this sleeping bag on my way to Colorado from Alabama. Before leaving, I realized I would need a bag that was lighter, smaller, and warmer than what I had at the time and decided to stop by REI on my way to the airport. This bag fit the bill- with down fill, it is super light, packs small, and performs well in cold weather. Since I was on the way to the airport, I had nearly no room left in my pack for a sleeping bag, but it compressed down great in the included compression bag and I had no problem fitting it in my pack. My first use of this bag was hiking in the Rockies- I camped at the base of a 14er and anticipated a relatively cool summer night (compared to what I'm used to in AL). The next morning I woke up to frost on the tent and had no idea it had gotten that cold because the bag was so warm. This is a 3-season bag, but if you live in the South with mild winters, it would definitely be great to use year-round, even in sub-freezing temps. Overall, it's a great bag and a great value- I'm definitely looking forward to many more nights outdoors with this bag!
Yes , I recommend this product
TarHeelJim
NoVA
Warm and lite weight
12 years ago
Great bag that packs small and weighs little but kept me warm will backpacking on the AT in March with temps in the low 20's. Would absolutely buy again!
Yes , I recommend this product
DirefulFall
Dundee, OR
Comments about my Radiant Long Wide bag
12 years ago
When you're 6'-3" at 280 pounds and want a roomy bag without losing warmth trying to find a good sleeping bag that is compact, light weight and warm is difficult. I purchased the REI Radiant in the Long Wide version and I'm very happy with my purchase. Although the zipper does snag easily, after the first couple times you learn how to hold the zipper to minimize the opportunity for a snag. The coldest temp I've been in with my Radiant was 39 degrees at approx 1,300 feet elevation. I was comfy and warm all night long. There's a lot of room without creating cold spots. It has down insulation in front and back. It fits into the stuff sack nicely. I use a waterproof compression sack as well. I can sinch it down to about the size of a volley ball. I would recommend the Radiant to anyone who is looking for a comfortable sleeping bag that can pack down.
Yes , I recommend this product
Deanna30
Peachtree City, Ga
Warm Bag
12 years ago
Stayed warm on the AT when temps were in the upper 30's. Kept dry and its a very cozy bag. Yes the zipper can snag if you zip it too quickly but definitely not a reason to not buy this bag. Great bag and great price.
Yes , I recommend this product
HokieScout
Charlotte, NC
A big boy bag for a big man.
11 years ago
I bought this bag based on the recommendations of the staff at REI. The staff was right on with their assessment of this bag. I have trouble sleeping when camping. This bag helped me sleep better. It is larger and more roomy than other bags. Get the long bag if your are taller than average. I sleep on my side and turn a lot at night and the bag has great room and feel. The night I went camping the temperature dropped to 27 degrees. I stayed warm in the bag. The zipper snags from time to time, but once I got use to it, I could make a clean zip.
Yes , I recommend this product
Nevada Mark
Nevada
The Best Bag Ever!
12 years ago
I love this bag! It is the best one I've ever had. I have the plus model. I am 6'4'' and 230 lbs. It is incredibly hard to find a bag that will fit me. So many say they have the right size but this is the only one for me and I have tried many. This bag is super comfortable, super warm, super light and orange, my favorite color. The price is low for this quality of workmanship. Kept me warm at below 20 degrees. Thank you REI!
Yes , I recommend this product
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