How to Choose Sleeping Bags for Backpacking
REI Co-op Serrana 20 Sleeping Bag - Women's
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With room in the hips and extra 600-fill-power down insulation in critical heat-loss areas, the 3-season REI Co-op Serrana 20 women's sleeping bag offers multiposition sleepers the comfort they need.
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Fill
600-fill-power duck down (RDS certified and bluesign® approved)
Temperature Rating (F)
19 degrees (F)
- With a European Norm (EN) comfort rating of 20°F, this bag is suitable for 3-season use
- Designed to fit a woman's body, this bag offers increased room at hips, decreased room at shoulders and extra insulation in critical heat-loss areas
- Water-repellent 600-fill-power duck down offers excellent loft and warmth in damp conditions—and it's certified to the Responsible Down Standard (RDS) and bluesign® approved
- Ripstop nylon shell also features a durable water repellent (DWR) finish to further protect the down fill
- Trapezoidal foot box provides foot comfort and toe box baffle specifically positions down to insure foot warmth
- Relaxed shoulder-to-hip cut works well for multiposition sleepers
- Contoured hood, insulated face muffler and full-length draft tube all work to keep warmth in
- Differentiated hood and neck drawcords simplify adjustments; antisnag zipper works smoothly
- Bag has a stash pocket under the collar
- Pad loops let you strap the bag to your sleeping pad (straps and pad sold separately)
- Most REI backpacking bags can be zipped to other REI backpacking bags; women's bags zip on the right, unisex on the left
- Includes a nylon stuff sack and a large cotton storage bag
- Contains materials that meet the bluesign® criteria
- 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 | 7 degrees (F) - EN |
| Tested Comfort | 20 degrees (F) - EN |
| Temperature Rating (F) | 19 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Shell | 30-denier ripstop nylon |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 600-fill-power duck down (RDS certified and bluesign® approved) |
| Lining | 50-denier polyester taffeta |
| Sleeping Bag Shape | Mummy |
| Stuff Sack Size | 8 x 18 inches |
| Gender | Women's |
| Sustainability | Down certified to the Responsible Down Standard (RDS) 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.
