How to Choose Sleeping Bags for Backpacking
REI Co-op Lumen Sleeping Bag - Long
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This 3-season mummy bag features amazing compressibility and warmth while offering you more room around your shoulders and hips so you can shift about and get comfortable.
Shop similar productsKey Details
Fill
Polyester fibers
Weight
2 lbs. 15 oz.
Temperature Rating (F)
25 degrees (F)
- Durable polyester insulation is highly compressible and provides warmth even when damp
- Shingle construction with overlapping layers distributes insulation evenly so there are no cold spots
- Durable ripstop-nylon shell fabric is treated with a durable water repellent finish to resist water and dry quickly; nylon taffeta lining is soft and tear-resistant
- Efficient mummy shape has a relaxed fit through the shoulders and hips for more room to move
- Contoured hood, insulated full-face muffler and full-length zipper draft tube with ground-level seams work together to keep warmth in and cold out
- External chest pocket keeps small essentials handy
- Pocket in hood can be stuffed with clothing layers to make a pillow
- Pad loops provide attachment points to keep sleeping bag and pad together (straps not included)
- Full-length zipper is backed by wide, antisnag binding tape
- Differentiated drawcords (1 round, 1 flat) allow quick identification
- Nylon stuff sack and cotton storage bag included
- European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
- Special buy
- 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
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 | 27 degrees (F) - EN |
| Tested Comfort | 36 degrees (F) - EN |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -4 degrees (C) |
| Weight | 2 lbs. 15 oz. |
| Shell | Ripstop nylon |
| Zipper Location | Left |
| Insulation Type | Synthetic |
| Fill | Polyester fibers |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | 78 inches |
| Shoulder Girth (in.) | 62 inches |
| Hip Girth (in.) | 58 inches |
| Stuff Sack Size | 9 x 20 inches |
| Stuff Sack Volume | 20.8 liters |
| Compressed Volume | Unavailable |
| 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.
