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.
