How to Choose Sleeping Bags for Backpacking
REI Co-op Magma 15 Sleeping Bag - Women's
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If you want to hike ultralight and sleep well at night, look no further—850-fill-power goose down gives the women's REI Co-op Magma 15 sleeping bag our highest warmth-to-weight ratio.
Shop newer versionKey Details
Fill
850-fill-power goose down (bluesign approved)
Temperature Rating (F)
17 degrees (F)
- Designed specifically for women, with increased hip room and decreased shoulder room for improved thermal efficiency
- Generous knee and foot space and a fitted silhouette help deliver the most efficient warmth-to-weight ratio in the REI Co-op brand sleeping bag line
- Downproof Pertex® shell, water-resistant 850-fill-power goose down and supple 15-denier lining combine to provide lasting coziness and a supersoft feel
- Down is bluesign® approved
- Trapezoidal footbox keeps feet comfy; a toe box baffle positions downward to provide warmth
- Variable baffle spacing locates and stabilizes the down fill, delivering high thermal efficiency and reducing weight
- Zipper cover and internal antisnag strip combine for easy zipping; a hybrid zipper path provides easy access along shoulders and torso
- Contoured hood retains warmth while providing space for a low-profile pillow; 2 different hood drawcords allow internal adjustment to avoid heat loss
- Insulated yoke fills neck and shoulder gap to prevent heat loss
- Includes a stuff sack for packing and a roomy mesh sack for breathable storage
- 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
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 Magma 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 | 3 degrees (F) - EN |
| Tested Comfort | 17 degrees (F) - EN |
| Temperature Rating (F) | 17 degrees (F) |
| Temperature Rating (C) | -8.3 degrees (C) |
| Shell | Pertex 15-denier ripstop nylon (bluesign approved) |
| Zipper Location | Right |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850-fill-power goose down (bluesign approved) |
| Lining | 15-denier ripstop nylon (bluesign approved) |
| Sleeping Bag Shape | Mummy |
| Shoulder Girth (in.) | 60 inches |
| Hip Girth (in.) | 57 inches |
| Stuff Sack Size | 7.5 x 15 inches |
| Stuff Sack Volume | 10.9 liters |
| Gender | Women's |
| Sustainability | 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.
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Most Helpful Favorable Review
Great for a smaller women who gets terribly cold
Kristen4 years ago
Ive been looking for my own backpacking sleeping bag and get terribly cold at 5’3 and 100lbs. I was willing to put down some money for something super-extra-warm (I used coupons and gift cards anyways). I’ve only tried it in 40 degree weather, but I actually got hot in it! I had to stick my head and arms out of it most of the night.
It’s also nice and short (women’s regular at 5’6). I’m not big enough to heat up extra bag space. It’s fluffy, the zipper seems durable, and I like the yoke to tuck around my neck.
Kristen
40 people found this review helpful
Most Helpful Critical Review
I’m somehow too fat for this bag
kthikes4 years ago
I want to love this bag, maybe one day I will love this bag, my big issue is it’s pretty narrow and if you’re not on the leaner or petite side you might be snug in it. I wear size 10/12 jeans and am 5’2 and my hips are pretty taut, making the down less poofy and thus colder hips. Makes me sad this bag doesn’t even come in multiple widths and that the basic size of it seems to assume such a (literally) narrow body type of a camper/backpacker. Maybe multiple widths with future models so customers don’t have to feel too fat to camp :(
kthikes
New England
48 people found this review helpful
Customer Images
Kristen
Great for a smaller women who gets terribly cold
4 years ago
Ive been looking for my own backpacking sleeping bag and get terribly cold at 5’3 and 100lbs. I was willing to put down some money for something super-extra-warm (I used coupons and gift cards anyways). I’ve only tried it in 40 degree weather, but I actually got hot in it! I had to stick my head and arms out of it most of the night. It’s also nice and short (women’s regular at 5’6). I’m not big enough to heat up extra bag space. It’s fluffy, the zipper seems durable, and I like the yoke to tuck around my neck.
Weight:Less than 100 lbs.
Height:5'3"
Yes , I recommend this product
Girl Scout hiker
Tempe, AZ
Not smothered, just right!
5 years ago
I am 5'6" and weight 150 lbs, I ordered the women's regular and it's perfect. I am a backpacker, not ultralight thought,so this was perfect for me. I had ordered this bag two years ago and sent it back because I did not like the zipper position-straight up and down. I get hot at night so need to open my bag a little, I do not like my backside hanging out, I just want cool air. The zipper position on this bag is perfect because it curves toward the front, not leaving my backside hanging out. It has just enough shoulder room to feel comfortable and not smothered. I wish the draft collar was removable but I'll live with it. It's a keeper.
Yes , I recommend this product
Sabine
Over designed Collar
3 years ago
I went on 3 trips before I wrote this review. The sleeping bag is as warm as advertised. I am a cold sleeper and felt toasty in it. I reduced it by one star because the draft collar drives me crazy. The wormy ends are constantly in my nose or mouth when I don’t zip up the bag all the way. When it is zipped up I don’t like it to have always something on my throat. This collar is only made for closed sleeping bags, but in real life you go through the phases, it is too warm to close and in the night you close all the way. I will cut the collar in half.
Age:55–64
Weight:125–150 lbs.
Height:5'7"
Yes , I recommend this product
echoben71
Aliso Viejo, CA
Long Version = Magma 10 Men's Reg
6 years ago
I had a Magma 10 men's regular, but switched to the newer Magma 15 in women's long mainly for the right side zipper and higher fill weight (24oz vs 17oz). Both are the exact same dimensions. I'm 5'10" and 190lbs. The newer men's Magma 15 adds 3" in shoulder girth vs the previous Magma 10, but loses 5oz of fill. REI should just make these options instead of trying to tailor by gender (different lengths/widths, different fills, and right vs left zip). Bag is very warm and lofts easily. Where the 10 was just ok in the low 30s/upper 20s, this is warm easily down to 20. This is a steal when it's on-sale.
Yes , I recommend this product
Pilgrim
Natick, MA
For Men Considering a Woman's Bag
3 years ago
I'm going to comment on fit for tall-ish men considering this bag. The amount of down is comparable to a 0-degree men's bag, which makes this bag a bargain during members' sales and is why I purchased it. I'm 187cm tall (just shy of 6'2"), 95kg (210 lbs), and I wear a 43-long suit jacket with 34" waist. I can fit snugly but comfortably while wearing a heavy down jacket in the woman's long of this bag. That said, I'm a back sleeper who doesn't move. It wouldn't work for me if I wanted room to move around or sleep on my side. If I was any bigger, I might have trouble manipulating the zipper closed. In other words, I'd consider myself to be just about the maximum size for this bag. For my purposes, that makes this bag a bargain for winter backpacking. YMMV
Age:55–64
Weight:200–225 lbs.
Height:6'2"
Yes , I recommend this product
Sugar AT 2019
Hiked the whole AT with this bag!
5 years ago
I did my entire thru hike of the Appalachian Trail with this bag, and while it was too hot to use on some nights, it kept me so warm once I got into the cold November weather. No issues with moisture; when it did get a little wet, it dried surprisingly quickly and kept me warm all the while. It's light and packs down small. It fit tight enough to ensure there would be no cold air pockets, but loose enough that I could move around (I'm a fidgety sleeper). My favorite feature was the combo of the hood and the collar that traps warm air in. I'm posting this review later on because I'm now shopping for a synthetic bag for warmer nights, and I wanted to revisit this posting so I could find something similar. Definitely sticking with an REI brand bag.
Yes , I recommend this product
kthikes
New England
I’m somehow too fat for this bag
4 years ago
I want to love this bag, maybe one day I will love this bag, my big issue is it’s pretty narrow and if you’re not on the leaner or petite side you might be snug in it. I wear size 10/12 jeans and am 5’2 and my hips are pretty taut, making the down less poofy and thus colder hips. Makes me sad this bag doesn’t even come in multiple widths and that the basic size of it seems to assume such a (literally) narrow body type of a camper/backpacker. Maybe multiple widths with future models so customers don’t have to feel too fat to camp :(
Age:25–34
Weight:150–175 lbs.
Height:5'3"
Yes , I recommend this product
sailboat727
Very Warm
6 years ago
I was hesitant to purchase this bag at first, because I was unsure of how well it would perform. Let me tell you I was not let down. The temperature outside was 20 degrees Fahrenheit and the snow began to fall down. Once I got into the bag, within 5 minutes, I was feeling very warm all over. I am a young man, and needed a bag that could perform well for cold weather nights here in New England. I feel as though this bag could perform well in even colder temps. This bag paired with the Neo X-therm pad worked great while sleeping on top of the combination of ice and snow. I can definitely reccomend this bag for cold weather camping enthusiasts. What’s great too, is the bag compresses down pretty small into its stuff stack, allowing a lot more free space in my backpack.
Yes , I recommend this product
Kathy
Las Vegas NV
Warm, fluffy and compact
2 years ago
Slept in this bag in Montana for the week. Temperatures only dropped to the 50s, but I slept comfortably in just the bag and no tent (in thermals with minimal sleeping pad). It was extra fluffy which made it feel cozy. I didn't feel too buggled up even though it was a bummy. I am 5'8 and if I was slightly taller, it might not have been long enough. I love this bag!
Age:35–44
Weight:125–150 lbs.
Height:5'8"
Yes , I recommend this product
Meesh
Oakland, CA
Warm and cozy
5 years ago
I used this sleeping bag for my entire PCT hike. I'm 5'7" and opted for the long version, which was a good choice. I used this in conjunction with the Thermarest NeoAir XTherm. My setup kept me warm and cozy in the Cascades and the Sierra, and worked well enough as a blanket if I unzipped it and tossed it over me on warmer nights. My only complaints were the neck yoke stitching isn't the strongest and I accidentally tore through it one morning, and the zipper stopped zipping closed about 2,000 miles into my hike. FYI I replaced my broken zipper bag with a new one of the same model. I'd absolutely recommend this sleeping bag for folks who won't be using it nearly every night for months on end, but you may want to look for something a bit sturdier for a thru hike.
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