How to Choose Sleeping Bags for Backpacking
Big Agnes Anthracite 20 Sleeping Bag - Women's
$139.95
Members get an est. $13.99 in rewards
Stay cozy in the women's Big Agnes Anthracite 20, a mummy-style sleeping bag that's light enough to stuff in your pack for summer backpacking but comfy enough for backyard campouts with the kids.
Key Details
Fill
Fireline PRO Eco recycled synthetic fibers
Weight
Regular - Right Zip: 3 lbs. 1 oz.
Long - Right Zip: 3 lbs. 9 oz.
Compressed Volume
Regular - Right Zip: 11 liters
Long - Right Zip: 11.4 liters
Temperature Rating (F)
20 degrees (F)
This purchase pays for membership!
$13
10% Reward
on this and every eligible full-price item*
+
$30
Bonus Card
valid for 60 days after joining*
=
$43
Value
Start earning when you buy a $30 lifetime membership.
Keep shopping
- This women-specific bag differs in shape and fill weight with a less drastic taper from shoulders to hips to feet—reducing cold spots and creating more warmth where it counts
- Lightweight, increased thermal value with traditional mummy shape—designed to contour to your figure for the most thermally efficient and comfortable night's sleep
- Recycled ripstop shell fabric and lining feature a PFC-free water-repellent finish
- Fireline™ PRO Eco Recycled synthetic insulation is made with multidenier, short-staple fibers with high loft to efficiently trap heat
- Comfortable hood contours to the shape of your face for a snug fit
- Low-profile cordlock lets you uncinch the hood with one hand
- Insulated tube along upper hood opening seals out drafts when cinched
- Antisnag, 2-way zipper with zipper garage offers a smooth, quick zip
- No-draft collar and no-draft zipper
- Interior fabric loops let you secure a sleeping bag liner (liner not included)
- Exterior loops for hang drying or storage
- Mate together left and right zip bags (additional sleeping bag not included)
- Stuff sack included
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. Backpacking bags are typically rated for temperature according to an independent testing protocol—currently International Organization for Standardization (ISO) 23537, though some older items followed European Norm (EN) 13537. 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
View all Big Agnes 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. Some brands determine their own temperature rating by aligning to the Comfort rating for women’s bags, to the Lower Limit rating for men’s bags, or somewhere in the middle for nongendered bags.
| Best Use | Backpacking |
|---|---|
| Tested Lower Limit | 14 degrees (F) - ISO |
| Tested Comfort | 25 degrees (F) - ISO |
| Temperature Rating (F) | 20 degrees (F) |
| Temperature Rating (C) | -7 degrees (C) |
| Weight | Regular - Right Zip: 3 lbs. 1 oz. Long - Right Zip: 3 lbs. 9 oz. |
| Shell | Recycled 20-denier 400T polyester ripstop with PFAS-free water-repellent finish |
| Zipper Location | Right |
| Insulation Type | Synthetic |
| Fill | Fireline PRO Eco recycled synthetic fibers |
| Fill Weight | Regular - Right Zip: 2 lbs. 5 oz. Long - Right Zip: 2 lbs. 10 oz. |
| Sleeping Capacity | 1-person |
| Lining | Recycled 50-denier 300T polyester pongee |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Regular - Right Zip: 66 inches Long - Right Zip: 72 inches |
| Shoulder Girth (in.) | Regular - Right Zip: 54 inches Long - Right Zip: 57 inches |
| Hip Girth (in.) | Regular - Right Zip: 53 inches Long - Right Zip: 56 inches |
| Stuff Sack Size | 10 x 21 inches |
| Stuff Sack Volume | 27 liters |
| Compressed Volume | Regular - Right Zip: 11 liters Long - Right Zip: 11.4 liters |
| Gender | Women's |
| Sustainability | Contains recycled materials |
Buying Advice
Review this Product
Adding a review will require a valid email for verification
Most Helpful Favorable Review
Beware - VERY TIGHT
annaraven1 year ago
I'm not a big person - 5'5" 145 pounds, but I couldn't finish zipping it up because it was too tight at my shoulders. Seemed like it would be great a VERY small woman.
annaraven
7 people found this review helpful
Most Helpful Critical Review
Tiny bag
Nic2 years ago
Bought this bag after trying the men’s. The bag is way too tight for me. I’m 5’2” and 150 lbs and was quite claustrophobic. It was very warm but will immediately be going back!
Nic
9 people found this review helpful
Customer Images
Jassmyn
San Diego, CA
Great synthetic bag
10 months ago
I backpack and was looking to upgrade my sleeping bag for the first time and needed a Synthetic bag because I choose to be vegan. I went to REI and tried lots of bags out all that were synthetic and I just really liked how comfy this bag was for me. I’m a size 8/10 5’5 woman for reference and I got a women’s regular, the bag was just tall enough for me but I felt I had plenty of room to even turn in the night if I wanted to. I love mummy bags though and have no problem feeling confined in them. This bag was very comfortable and very warm for me. I tend to run very cold and I got to try this bags a few times now, the lowest it got was low 30’s so never got to test it to its lower limits but I was extremely warm in that temp. I love this bag!
Age:18–24
Weight:125–150 lbs.
Height:5'5"
Yes , I recommend this product
annaraven
Beware - VERY TIGHT
1 year ago
I'm not a big person - 5'5" 145 pounds, but I couldn't finish zipping it up because it was too tight at my shoulders. Seemed like it would be great a VERY small woman.
Age:55–64
Weight:125–150 lbs.
Height:5'5"
Shawn
Oregon
Uncomfortably Tight Despite the Warmth
2 months ago
I’m 5'2" and 150 lbs, and the Big Agnes Women's Anthracite 20 Synthetic Sleeping Bag was uncomfortably tight. I expected a bit more room to move around, but it felt constricting, especially around the shoulders and hips. While it is definitely warm, the lack of comfort made it impossible to get a good night's sleep. Unfortunately, I’ll be returning it. Wouldn’t recommend for anyone who values space and comfort.
Age:35–44
Weight:150–175 lbs.
Height:5'2"
No, I do not recommend this product
Wally
Light but too big & bulky
1 month ago
I cannot say if the Big Agnes sleeping bag is good as it was way to big and bulky to fit my needs. By the description, 3 lbs, I thought it would be perfect for a 3 wk trekking trip, but sadly it would take up my whole backpack.
sarah
tight fit
1 year ago
If you have wide hips this is not for you, this is my first mummy bag but I wasn’t expecting not being able to zip it up past my hips unless I scooted up in the bag first. I wear a size 10/12 pants so if you’re in that range I’d consider something else. I also didn’t feel like it was very warm was in about 30 degree weather and was pretty chilly still.
Age:25–34
Weight:150–175 lbs.
Height:5'5"
No, I do not recommend this product
maka0442
Oregon
Good Bag for Camping
1 year ago
Very good sleeping bag. Comfortable, warm, and seems like it will be durable over time. There are few tradeoffs that would be nice to have like compression straps on the stuff sack and a storage bag, but that is understandable for this price point. This is plenty warm for cool season camping in Oregon. I recommend it!
Age:35–44
Weight:125–150 lbs.
Height:5'7"
Yes , I recommend this product
Al212
CA
Too small
3 months ago
Like many other reviews say, this bag was tight! I unfortunately did not read these reviews before purchase. I used it for a couple of nights bikepacking in the desert in Jan & getting some chillier nights, I also found that the inside of the zipper was very cold- which I haven't experienced with other bags. I liked the weight of this product versus other synthetic filled ones, but ultimately will return.
Age:25–34
Weight:125–150 lbs.
Height:5'2"
No, I do not recommend this product
Nic
Tiny bag
2 years ago
Bought this bag after trying the men’s. The bag is way too tight for me. I’m 5’2” and 150 lbs and was quite claustrophobic. It was very warm but will immediately be going back!
No, I do not recommend this product
kkpatin12
Dallas, TX
Really good Bag!
8 months ago
Really like this bag! It kept very toasty at 40 degrees and I’m sure that’s not even close to the comfort limit. The zipper was well thought out to help prevent from snagging. It also was the right length and width for me. I’m 5’4 and around 130 Ibs with mid to wide hips. It fit me personally well. The only thing that would have made this bag even better is compression sack and also arm holes. However, with armholes you sacrifice some warmth. Overall recommend!!!
Age:25–34
Weight:125–150 lbs.
Height:5'4"
Yes , I recommend this product
Gen
SoCal
Great for new campers!
1 year ago
I bought this upon the recommendation of another friend who has more camping experience than me. I’m so glad I was able to purchase it while on sale. I tested it out and I immediately felt cozy. Honestly, I felt like a swaddled baby. I’m also a figure-4 sleeper, and I was able to achieve the position - albeit a lil tight - but enough for me to feel comfortable. To be fair, I haven’t tested it outdoors yet but it’s promising! It’s also very easy to pack up.
Yes , I recommend this product
1 - 10 of 16 Reviews