How to Choose Sleeping Bags for Backpacking
REI Co-op Serrana 20 Sleeping Bag - Women's
This product is not available.
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.
Shop similar productsKey Details
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
- 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
- Contains materials that meet the bluesign® criteria
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.
Review this Product
Adding a review will require a valid email for verification
Most Helpful Favorable Review
Generously roomy
rabbit8 years ago
Received free productThis sleeping bag seemed fairly bulky when I first unpacked it, and heavier than I expected. The shell material is thick and stiff, and its overall size is large. Visually, the vivid blue color is striking, and a nice color that I don't often see in gear. It comes with both a large mesh storage bag and a small compression sack.
I took it out on a two-night, 16 mile early June backpacking trip in Western PA; because I was expecting rain, I packed it in a waterproof stuff sack. There's a lot of material to pack down, even for a 20F bag, and I had trouble getting it into my 14L dry sack with a bag liner and a dry change of clothes (this is normally not a problem for me with the REI Halo, which is also a 20F bag). I used this with a synthetic bag liner, an inflatable sleeping pad, and a bug bivvy. For one night, I slept on the dirt with a tarp for rain cover, and for the second night, I slept in a wooden Adirondack shelter.
In use, the stiff shell holds it shape when pushed around; on one hand, this meant I wasn't getting tangled up in it the way I do with softer bags, but on the other hand, this left air pockets that tended to get cold. The built-in draft collar was too short to tuck over my neck and under my shoulders, and doesn't cinch down in any way, so I found it ineffective; the drawstring for the head opening was sufficient for the conditions I experienced.
It's also an extremely roomy, wide bag, especially from the hips up. I have a fairly slim/petite build, and I could lie on my back with both hands on my hips, sticking my elbows out as far as I could, and the bag wouldn't bind up at all. This bag is wider than my sleeping pad at the torso, and the extra space contributed to cold spots. I only had lows around 50F, so the cold spots were not a problem, but I'd be worried about it in conditions closer to the 20F rating. The shell material seemed to repel a small amount of water, because despite a little bit of rain dampness, the down didn't seem to get waterlogged.
The zipper design was effective at not catching any material, but I found it unforgiving to re-zipping when I accidentally unzipped it all the way. The ends barely have enough freedom of movement to get each side into the right position to re-zip; since I was using this in a bivvy sack and thus didn't have a lot of room to maneuver, it was extremely frustrating to get it back together.
Overall, I think this sleeping bag would be better suited to usage in a tent, by someone with a bigger build who can fill up more of the internal space. I can also imagine it being more comfortable for someone who tends to move around a lot in their sleep, or desires a less constricted sleeping bag experience. It's not well-suited to a more minimal backpacking style, considering the added weight and bulk.
rabbitReceived free product
Pittsburgh, PA
18 people found this review helpful
Most Helpful Critical Review
Generously roomy
rabbit8 years ago
Received free productThis sleeping bag seemed fairly bulky when I first unpacked it, and heavier than I expected. The shell material is thick and stiff, and its overall size is large. Visually, the vivid blue color is striking, and a nice color that I don't often see in gear. It comes with both a large mesh storage bag and a small compression sack.
I took it out on a two-night, 16 mile early June backpacking trip in Western PA; because I was expecting rain, I packed it in a waterproof stuff sack. There's a lot of material to pack down, even for a 20F bag, and I had trouble getting it into my 14L dry sack with a bag liner and a dry change of clothes (this is normally not a problem for me with the REI Halo, which is also a 20F bag). I used this with a synthetic bag liner, an inflatable sleeping pad, and a bug bivvy. For one night, I slept on the dirt with a tarp for rain cover, and for the second night, I slept in a wooden Adirondack shelter.
In use, the stiff shell holds it shape when pushed around; on one hand, this meant I wasn't getting tangled up in it the way I do with softer bags, but on the other hand, this left air pockets that tended to get cold. The built-in draft collar was too short to tuck over my neck and under my shoulders, and doesn't cinch down in any way, so I found it ineffective; the drawstring for the head opening was sufficient for the conditions I experienced.
It's also an extremely roomy, wide bag, especially from the hips up. I have a fairly slim/petite build, and I could lie on my back with both hands on my hips, sticking my elbows out as far as I could, and the bag wouldn't bind up at all. This bag is wider than my sleeping pad at the torso, and the extra space contributed to cold spots. I only had lows around 50F, so the cold spots were not a problem, but I'd be worried about it in conditions closer to the 20F rating. The shell material seemed to repel a small amount of water, because despite a little bit of rain dampness, the down didn't seem to get waterlogged.
The zipper design was effective at not catching any material, but I found it unforgiving to re-zipping when I accidentally unzipped it all the way. The ends barely have enough freedom of movement to get each side into the right position to re-zip; since I was using this in a bivvy sack and thus didn't have a lot of room to maneuver, it was extremely frustrating to get it back together.
Overall, I think this sleeping bag would be better suited to usage in a tent, by someone with a bigger build who can fill up more of the internal space. I can also imagine it being more comfortable for someone who tends to move around a lot in their sleep, or desires a less constricted sleeping bag experience. It's not well-suited to a more minimal backpacking style, considering the added weight and bulk.
rabbitReceived free product
Pittsburgh, PA
18 people found this review helpful
Customer Images
Nikki072
Received free product
Phoenix, AZ, United States
Really warm and comfy!
8 years ago
I used this bag for three days of car camping in Flagstaff. Our average temps at night were in the high 30's and low 40's and I was never cold. I am primarily a side sleeper and had enough room to shift to my side without the bag twisting too much. My favorite parts of this bag are the foot box and the hood. My feet are always cold and the foot box was always warm. The hood was comfy and the baffle around the neck kept my heat in. I'm 5'5, 200 lbs and this bag fit me wonderfully. My only complaint is that the bag is too heavy to hike with.
Yes , I recommend this product
Summer
Received free product
Ashland, OR, United States
Cozy and comfortable
8 years ago
I used this bag on a recent trip at slightly higher elevation and found it super comfy. The hood was roomy enough for my camping pillow to fit without pushing my head out into the open. I'm 5'2" and a bigger gal and in the "regular - wide" bag I felt comfortable and could adjust positions while I slept. The only trouble I had with the bag, and it was a small one, was that the zipper consistently caught on the gusset at the bottom of the zipper when unzipping the bag all the way or nearly all the way. The bag packed down well into its compression sack so it was a nice addition to my pack without taking up a ridiculous amount of space.
Yes , I recommend this product
KeepOnClimbing
Received free product
Chapel Hill, NC, United States
Warm and roomy
8 years ago
The Women's Serrana bag will keep you warm and happy through out the night. I am 5'4" and the regular size was long enough for me, but if you are 5'6" or taller I would go with the long version. Pros: It is warm and packs down nicely using a compression sack. It has a very roomy toe box and hip/shoulder area so you can turn and maneuver around during the night. The zipper design reduces snags so it zips up nicely. The blue is very pretty and it has the feeling of a very durable product. Cons: The fabric is thicker and can feel a bit sticky if you are camping in warmer weather.
Yes , I recommend this product
Gemma
Anza Ca
Live in it. Really.
6 years ago
Can I give it 10 stars? Most memorable time with this bag was waiting to get into camp 4 in yosemite. I hauled out this bag and my rei 2.5 camp pad and slept though the wait. Slept better than at home. When I woke up there was snow and I had a line of 50 plus people behind me with many giving my yearning looks.
Yes , I recommend this product
Puj09
Received free product
East Lansing, Michigan, United States
Warmth in a small bundle
8 years ago
Took this out camping with us on the Memorial day weekend at Yankee Springs recreational park. It was warm in the day time, but temperatures fell to 54F with a sensation of 41F at night. The sleeping bag was very warm, comfy, spacious and very easy to roll up. Additionally, in contrast to my previous bags, this one has a 'chest protection'flap; once inside the bag the flap covers around your neck and does not let cold air in. Used over a sleeping pad, was very comfortable.
Yes , I recommend this product
michelle3417
Received free product
Hanover, NH, United States
Warm and comfortable sleeping bag
8 years ago
I brought this on a backpacking trip over Memorial Day weekend to the Green Mountains in Vermont. Although temperatures dipped below 50, I was toasty warm in my bag. I sleep on my stomach and really appreciated the roominess the bag afforded. I also liked the face muffler which I imagine would come in handy in colder temperatures and/or windy conditions when cowboy camping. I got a kick out of the stash pocket too. It fit snuggly in my 10L compression sack and didn't take up too much room in my pack. Highly recommend the bag for the features and price!
Yes , I recommend this product
mirandanmyers
Kirkland, WA
Can be used for backpacking- extremely warm!
8 years ago
I just took this bag out on a week long hammock camping trip through Sequoia National Park and then onto Yosemite. It got into the low 40s-upper 30s at night and I was snug as a bug. However, I did need a sleeping pad under the bag inside my doublenest hammock. Hammocks provide absolutely no insulation, so I found that sleeping without the sleeping pad made my back feel a little drafty in the middle of the night and I had to put it back in the hammock. I love the loftiness of this bag, the wind collar works excellently, and the zipper and hood cinch work fantastic. As a matter of fact, when I was using the sleeping pad I had to unzip the sleeping bag part way throughout the night because I was a bit too warm. I have a 65 L Osprey backpacking pack that I used to keep this in when traveling and although it was a snug fit, it worked and doesn't pose any problems for me personally. There's smaller bags out there for sure, but I'm not too opposed to the weight and compressed size of this one. The pros outweigh the cons in my opinion! I also go to school and live up in Washington state, so I really liked how the bag has waterproof down filling. Warmth, and the ability to dry easily is a plus.
Yes , I recommend this product
HappyMama
Portland, OR
Warm and spacious and perfect for co-sleeping!
4 years ago
My daughter and I LOVE this sleeping bag. Before this bag, she consistently came into my bag during the night, leaving me half out of a bag and rather cold. We upgraded to this in the regular wide and we can both sleep comfortably! I am 5 feet approx 120 lbs; she was 3+ when we got this and 7.5 when we used it most recently. Now, even at 7.5 when she climbs in to snuggle in the middle of the night we can be zipped up and cozy. The extra width makes it so she can snuggle it to the "spooning" position quite well. Also, when i sleep in it solo, i stay warm and cozy. I'd give this bag 10 stars if possible. Thanks REI!
Age:35–44
Height:5'0"
Yes , I recommend this product
BikeHer
Oklahoma City
Side/stomach sleepers rejoice!
5 years ago
I bought the regular wide bag. I took this bag out last weekend for an overnight backpacking trip and it's one of the best nights sleep I've had in years. I've been a mummy bag user, a quilt user and now this bag (this is the 5th sleeping bag/quilt I've used backpacking in my search for a warm enough night's sleep). Traditional mummy bags are way too narrow for me as a side/stomach sleeper so I switched to quilts. I tried 2 different quilts (from big name cottage companies) but no matter how I attached it to the pad, I always felt drafts and had to readjust the quilt around me everytime I changed positions (which is a lot). I'm a side sleeper, stomach sleeper, one knee up sleeper, fetal position sleeper. I flip/flop all night long. The wide version is SOOOO roomy and I never got tangled, felt drafty, or felt confined or restricted tossing and turning all night. Temps were in the low 40's and I was super comfy/warm in socks, shorts, and a long sleeve shirt (long sleeve because my arm rests under my pillow and somewhat exposed to the elements. I'm 5'4" and 170lbs. I had so much room in there, I even could change clothes inside the bag so I didn't have to go out in my pajamas. Pros: *very roomy (but not so much that I had pockets of cold air inside the bag). *I can flip flop all night long and never feel drafts or get tangled up in the bag. *Very warm bag and material is soft and comfy against the skin. Cons: *slightly heavy for backpacking *slightly bulky for backpacking (these two cons are not cons if you are car camping) The bag is on the heavy/bulky side for backpacking. However, this is my 5th try at a warm night's sleep. I've had bags anywhere from a 19oz 10° quilt to this 3lb 3oz bag and everything in between. This is the first time I've slept well, so I'm willing to sacrifice weight for comfort on this item. I'll cut pack weight elsewhere. At my age, sleep is so critical to my success backpacking, I'm willing to carry extra weight for my comfort.
Yes , I recommend this product
rabbit
Received free product
Pittsburgh, PA
Generously roomy
8 years ago
This sleeping bag seemed fairly bulky when I first unpacked it, and heavier than I expected. The shell material is thick and stiff, and its overall size is large. Visually, the vivid blue color is striking, and a nice color that I don't often see in gear. It comes with both a large mesh storage bag and a small compression sack. I took it out on a two-night, 16 mile early June backpacking trip in Western PA; because I was expecting rain, I packed it in a waterproof stuff sack. There's a lot of material to pack down, even for a 20F bag, and I had trouble getting it into my 14L dry sack with a bag liner and a dry change of clothes (this is normally not a problem for me with the REI Halo, which is also a 20F bag). I used this with a synthetic bag liner, an inflatable sleeping pad, and a bug bivvy. For one night, I slept on the dirt with a tarp for rain cover, and for the second night, I slept in a wooden Adirondack shelter. In use, the stiff shell holds it shape when pushed around; on one hand, this meant I wasn't getting tangled up in it the way I do with softer bags, but on the other hand, this left air pockets that tended to get cold. The built-in draft collar was too short to tuck over my neck and under my shoulders, and doesn't cinch down in any way, so I found it ineffective; the drawstring for the head opening was sufficient for the conditions I experienced. It's also an extremely roomy, wide bag, especially from the hips up. I have a fairly slim/petite build, and I could lie on my back with both hands on my hips, sticking my elbows out as far as I could, and the bag wouldn't bind up at all. This bag is wider than my sleeping pad at the torso, and the extra space contributed to cold spots. I only had lows around 50F, so the cold spots were not a problem, but I'd be worried about it in conditions closer to the 20F rating. The shell material seemed to repel a small amount of water, because despite a little bit of rain dampness, the down didn't seem to get waterlogged. The zipper design was effective at not catching any material, but I found it unforgiving to re-zipping when I accidentally unzipped it all the way. The ends barely have enough freedom of movement to get each side into the right position to re-zip; since I was using this in a bivvy sack and thus didn't have a lot of room to maneuver, it was extremely frustrating to get it back together. Overall, I think this sleeping bag would be better suited to usage in a tent, by someone with a bigger build who can fill up more of the internal space. I can also imagine it being more comfortable for someone who tends to move around a lot in their sleep, or desires a less constricted sleeping bag experience. It's not well-suited to a more minimal backpacking style, considering the added weight and bulk.
Yes , I recommend this product
1 - 10 of 23 Reviews