How to Choose Sleeping Bags for Backpacking
REI Co-op Zephyr 25 Recycled Sleeping Bag - Women's
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Ideal for 3-season backpacking, the women's REI Co-op Zephyr 25 recycled sleeping bag is our top synthetic design—light, compressible, cozy, and now with recycled materials throughout.
Shop similar productsKey Details
Fill
Recycled polyester fibers
Temperature Rating (F)
25 degrees (F)
- Women-specific design offers more room in the hips and a slightly narrower shoulder girth for the best fit and thermal efficiency
- 100% recycled synthetic polyester insulation is durable and highly compressible; the fill also retains some insulating ability if it gets wet
- Shingle construction on top provides uniform loft and prevents insulation from shifting and creating cold spots
- Offset quilt construction on the bottom optimizes bag/pad system warmth while reducing unnecessary weight and bulk
- Mummy shape is thermally efficient, yet roomy enough from shoulder to knee to ensure sleeping comfort
- Trapezoidal footbox gives room to wiggle toes and the baffle in the toe box holds extra insulation in place to help keep feet warm
- Hood, insulated muffler and full-length zipper draft tube keep warmth in and cold out; hood conforms to the head and can accommodate a backpacking pillow
- Zipper cover and internal antisnag strip combine for easy zipping
- Stash pocket under collar holds small essentials
- Differentiated drawcords allow quick hood and neck adjustments in the dark
- 100% ripstop recycled polyester shell offers durability with abrasion- and tear-resistance for years of use
- Durable water repellent (DWR) finish on shell helps keep bag from getting damp if it comes in contact with condensation on tent walls
- 100% recycled nylon liner is soft and silky for freedom of movement
- Nylon stuff sack and polyester storage bag are included
- 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
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 the REI Co-op Zephyr Product LineView 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 | 15 degrees (F) - ISO |
| Tested Comfort | 26 degrees (F) - ISO |
| Temperature Rating (F) | 25 degrees (F) |
| Temperature Rating (C) | -3.9 degrees (C) |
| Shell | Ripstop recycled polyester (bluesign® approved) |
| Zipper Location | Right |
| Insulation Type | Synthetic |
| Fill | Recycled polyester fibers |
| Lining | Recycled nylon (bluesign® approved) |
| Sleeping Bag Shape | Mummy |
| Shoulder Girth (in.) | 60 inches |
| Hip Girth (in.) | 59 inches |
| Gender | Women's |
| Sustainability | Contains materials that meet the bluesign® criteria Contains recycled materials 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.
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Most Helpful Favorable Review
Overall great sleeping bag!
rosebuch2 years ago
I bought this in May of 2022 because it was on sale but I was skeptical because it had 0 reviews! After using it on a 2 week road trip through Oregon, California, and Nevada, numerous trips to the Tetons and Zion NP, I absolutely love this bag! It is quite big for backpacking so it's definitely more of a camping bag but it's still pretty good. I worn a thick Patagonia fleece and sweats with leggings underneath them when camping in the cold Tetons and I never had a problem with the cold. I even ended up peeling off layers at night because the layers weren't necessary in the 15-20°. The zipper worked perfectly and never had any problems. I am 5'9" and got the tall and definitely recommend anyone of this height or taller get the tall, I would not have wanted it any shorter. For the price, I love this bag and will not be getting a new one anytime soon.
rosebuch
Indianapolis
31 people found this review helpful
Most Helpful Critical Review
not great and extremely bulky
veronika2 years ago
Bought this and had to return it after my first trip with it. The sleeping bag is huge and so much bigger than the images listed. Not at all a backpacking sleeping bag due to size. The fill is very stiff and not at all pliable. Feels very cheap for what it is. Save a little bit more and get a nicer bag
veronika
MN
9 people found this review helpful
Customer Images
SDariotes
Can bundle up with the dogs!🐶
1 year ago
I keep it in my 🚗 car in the 🥶 winter in case I need it!
Yes , I recommend this product
rosebuch
Indianapolis
Overall great sleeping bag!
2 years ago
I bought this in May of 2022 because it was on sale but I was skeptical because it had 0 reviews! After using it on a 2 week road trip through Oregon, California, and Nevada, numerous trips to the Tetons and Zion NP, I absolutely love this bag! It is quite big for backpacking so it's definitely more of a camping bag but it's still pretty good. I worn a thick Patagonia fleece and sweats with leggings underneath them when camping in the cold Tetons and I never had a problem with the cold. I even ended up peeling off layers at night because the layers weren't necessary in the 15-20°. The zipper worked perfectly and never had any problems. I am 5'9" and got the tall and definitely recommend anyone of this height or taller get the tall, I would not have wanted it any shorter. For the price, I love this bag and will not be getting a new one anytime soon.
Age:18–24
Weight:150–175 lbs.
Height:5'9"
Yes , I recommend this product
David
San Diego CA
Suitable for ladies who get cold
2 years ago
My girlfriend gets really cold at night and slept very comfortably in our tent while on our trip throughout Northern Arizona and Utah. Near the north rim of the Grand Canyon one night, the temperature dropped into the 30s and she slept without any issues. She is roughly 5 foot 9 inches and fit into the sleeping bag quite comfortably.
Age:25–34
Weight:150–175 lbs.
Height:5'9"
Yes , I recommend this product
JB Olympic Peninsula
Olympic Peninsula Washington State
Quality Construction and Top Notch Features
1 year ago
I have not had an opportunity to use this sleeping bag in cold temperatures yet, but there is much to be impressed by. I've been using a 30 degree REI sleeping bag for several years, and I was pleased that this newer model is just as well made. The fabric is soft and durable, and protection from the cold is readily apparent. I'm 5'10" and there is plenty of room at the foot. The only thing I'm unsure of is this bag is narrower than my last REI bag. Won't know the answer to comfort until I can spend the night in it. I tried to use it in 50 degree temps, but it was too warm for this temperature. Blue color is lovely. Inside color is far more green than it is grey.
Age:55–64
Weight:100–125 lbs.
Height:5'10"
Yes , I recommend this product
veronika
Minnesota
not great and extremely bulky
2 years ago
Bought this and had to return it after my first trip with it. The sleeping bag is huge and so much bigger than the images listed. Not at all a backpacking sleeping bag due to size. The fill is very stiff and not at all pliable. Feels very cheap for what it is. Save a little bit more and get a nicer bag
Age:18–24
Weight:100–125 lbs.
Height:5'6"
No, I do not recommend this product
Josh
Utah
Good but maybe not for long backpacking trips…
1 year ago
Got this for my wife on a deep discount, so for the price I paid I can’t say anything bad about it at all! It’s a great bag! But in the context of its retail price I give it 4 stars. Pros: - neck baffle - large anti-snag zipper - good material…no less than what you’d expect from REI -comes with both stuff sack and storage sack - nicely shaped foot box - good warmth-to-weight ratio Area for improvement: As other reviews have noted, it’s marketed as a “backpacking” bag but I dunno: it is a little bulky for backpacking. I’d say this is better suited for car camping or very short backpacking trips because this thing could eat up all the space in your backpack. Again, for the price and the warmth-to-bulk ration, it’s excellent. Just don’t get it thinking you’ll be getting an ultra-light backpacking bag.
Yes , I recommend this product
Moss
Comfortable and warm
2 years ago
I haven't tested this sleeping bag in really cold temperatures yet, as I received it prior to the cold season, however, upon trying it out it feels very comfortable and warm. It is stored in a big sack so it can breathe, and it comes with a smaller stuff sack for trips. I am excited to try it out this winter.
Age:25–34
Weight:100–125 lbs.
Height:5'4"
ElizE
Marietta, GA
Not as compact as I wanted
2 years ago
Not as compact as I wanted , I was looking for something that rolls up smaller
Age:45–54
Weight:125–150 lbs.
Height:5'8"
No, I do not recommend this product
Female backpacker
Did not fit me. Returned.
2 years ago
Did not fit me. The width at the shoulders was too small so the bag would have been impossible to zipped up.The draft collar was too low. I would have needed a neck like a giraffe if I didn't want the top of the bag to go over my head with it in place. The toe box was very roomy and nice. I returned it before trying it so I've no idea about the adequacy of the temperature rating. It does come with a nice storage bag as well as a stuff sack. I did NOT try putting it in the stuff sack so have no idea if it actually would have fit in it or not. I also don't remember looking at it to see if I thought it would be waterproof enough to carry hitched on a pack thru a rain storm. It came in the storage bag which seemed more than an adequate size and breathable.
Height:5'10"
Weight:175–200 lbs.
VT_B
Vermont
Great sleeping bag
2 years ago
I bought this because I liked that it was recycled materials. I like the feel of the bag- it's plenty warm and cozy! I'd recommend it.
Height:5'5"
Age:35–44
Weight:125–150 lbs.
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