The 3-season REI Lumen synthetic sleeping bag features amazing compressibility and warmth while balancing price and performance.
Fill
Polyester fibers
Temperature Rating (F)
25 degrees (F)
- With a European Norm (EN) lower-limit rating of 27°F, this bag is suitable for 3-season use
- Synthetic Thermawave polyester insulation is durable and highly compressible; synthetic polyester fill retains some insulating properties even when wet
- Shingle construction with overlapping layers distributes insulation evenly and keeps it from moving around so there are no cold spots
- Equally distributed insulation accommodates the multi-position sleeper; mummy shape is thermally efficient, yet roomy enough to ensure sleeping comfort
- Ripstop nylon shell fabric has a nice hand feel, is lightweight, durable, water- and abrasion resistant; nylon taffeta lining is soft and tear-resistant
- Relaxed fit through the shoulders and hips gives you room to move for a better night's rest
- Contoured hood, insulated full-face muffler, roomy footbox and full-length zipper draft tube with ground-level seams work together to keep heat in and cold out
- External chest pocket keeps small essentials—headlamp, watch, glasses—right at hand and easy to find in the dark
- Special pocket in hood can be stuffed with clothing layers to make a pillow that stays in place; no need for a pillow to take up valuable space in your backpack
- Pad loops provide attachment points to keep your sleeping bag and pad together, so you needn't worry about rolling onto the cold ground (straps sold separately)
- Full length zipper is backed by wide, antisnag binding tape
- Differentiated drawcords (1 round, 1 flat) allow quick identification, even in the dark, so neck and hood adjustments are a cinch
- 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
- REI is Climate Neutral Certified; as we work to actively reduce our footprint, we measure annual carbon emissions and purchase an equivalent amount of verified carbon credits
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) |
| Shell | Ripstop nylon |
| Insulation Type | Synthetic |
| Fill | Polyester fibers |
| Fill Weight | 25 / unavailable ounces |
| Lining | Nylon taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 9 x 20 inches |
| Stuff Sack Volume | 20.8 liters |
| Gender | Unisex |
| Sustainability | From a Climate Neutral Certified brand |