REASONS TO BUY
Super affordable
Dual anti-snag zipper
REASONS TO AVOID
Mummy-style fit runs tight
No pillow sleeve or pad attachments
Shallow hood
Difficult for side sleepers
Big Agnes Anthracite 20 - Women's Review
This budget-friendly bag is packable thanks to a tight-fitting mummy style design, but it doesn't allow much wiggle room
Credit: Trish Matheny
By Trish Matheny ⋅ Review Editor ⋅ May 16, 2026
RELATED: The Best Sleeping Bags for Women
Our Verdict
The Big Agnes Anthracite 20 is an affordable sleeping bag that's ideal for car camping or weekend backpacking trips, but a bit too heavy for long trips. The fibers don't provide a ton of loft, but the super-slim, mummy-style fit eliminates drafts along the interior. The women's specific fit also includes additional insulation for a warmer night's sleep, which we found comfortable until the temperatures began to dip below freezing. While the mummy-style fit aims to reduce weight and bulk, this is still a relatively heavy construction at 3.1 pounds, and the shape is slim and not inclusive for all body types. That said, the thick, 20-denier polyester exterior with PFAS-free water-repellent finish provides good durability. If you're after an affordable, synthetic, water-resistant design with a slim fit and durable construction for smaller trips, the Anthracite 20 may be worth your attention.
Our Analysis and Test Results
The Big Agnes Anthracite 20 is a budget-friendly, mummy style synthetic sleeping bag design that is warm but feels constrained. Credit: Trish Matheny
Likes
The Anthracite 20's comfort rating is right around freezing (32°F), which, when combined with the tight, draft-eliminating fit, is warm enough for late spring to early fall, though we wouldn't take it winter camping. The Anthracite's signature “Fireline Pro” eco-recycled Synthetic insulation compresses a bit, but doesn't provide enough loft for that warm and cozy feel. While we wish the hood wasn't so shallow, we found the draft tubes functional for trapping heat. If you plan on spending most of your time outdoors in warmer climates, this could be just enough insulation to get the job done.
Although a super affordable design, we love the women's specific measurements (even if they are a little snug), for a warmer construction. The anti-snag zipper also adds durability and functionality.
The tightly-fitted design is meant to decrease cold air drafts within the interior. Credit: Trish Matheny
Dislikes
The super tight mummy-style fit seeks to maximize warmth by reducing any draft inside the Anthracite 20, the only problem is that the sizing isn't inclusive for most female body types. After we climbed inside this bag (we tested the regular version), we were a bit uncomfortable due to the tight fit. That said, if you're petite, this could be perfect for you.
Although the Anthracite 20 is a mummy-style that reduces overall weight and bulk of the synthetic construction, at 49.6 ounces, it is among the heavier designs in our testing fleet. All told, the Anthracite isn't our first choice for backpacking due to the larger packed size and heavyweight synthetic construction.
The Anthracite weighs 3.1 pounds, so we don't recommend packing it very far. Credit: Trish Matheny
We also recommend purchasing an aftermarket compression sack to increase the packability. Credit: Trish Matheny
Should You Buy the Big Agnes Anthracite 20?
If you're on a budget and just after an entry-level sleeping bag design for a backpacking trip or two, the Anthracite 20 will keep you warm in cold temperatures. That said, the slim fit isn't for all women's body types, and the shallow hood doesn't trap as much body heat as we would like. However, it is affordable and potentially best suited for petite women or ladies who want a snug fit to reduce drafts and eliminate weight and bulk inside their backpack.
What Other Women's Sleeping Bags Should You Consider?
While the Anthracite 20 isn't a bad option for those seeking warmth in a snug-fitting synthetic construction, we would much rather sleep in the NEMO - Tempo 20 Synthetic. The Nemo spoon shape construction leaves extra space inside the bag for ladies who toss and turn, while the high loft provides the cozy feel of down. And speaking of down, if you're looking for an affordable down construction, check out the Kelty Cosmic Down 20. We think you'll love the sizing options and the women's specific features that maximize warmth.
Side-by-Side Comparison
Compare Big Agnes Anthracite 20 - Women's versus top competing products:
| Awards | |
|---|---|
| Price | $140 List Check REI (on sale!) |
Overall Score  |
|
| Star Rating | |
| Bottom Line | This budget-friendly bag is packable thanks to a tight-fitting mummy style design, but it doesn't allow much wiggle room |
| Pros | Super affordable, dual anti-snag zipper |
| Cons | Mummy-style fit runs tight, no pillow sleeve or pad attachments, shallow hood, difficult for side sleepers |
| Rating Categories | Big Agnes Anthracite 20 |
| Warmth (25%) | |
| Weight (25%) | |
| Comfort (20%) | |
| Packed Size (15%) | |
| Features (15%) | |
| Specifications | Big Agnes Anthracite 20 |
| Temp Rating (Lower Limit) | 14°F |
| Measured Weight (Size Tested) | 3.1 lbs (regular) |
| Insulation | Fireline PRO Eco recycled synthetic fibers |
| Female-Specific Features | a combination of increased insulation, as well as a fit that is shaped to contour to a woman’s body |
| Fill Weight (Size Tested) | 21 oz (regular) |
| Shell Material | Recycled 20-denier 400T polyester ripstop with PFAS-free water-repellent finish |
| Neck Baffle | Yes |
| Interior Pocket | No |
| Sleeping Pad Attachments | No |
| Zipper Length | 36 in |
| Shoulder Girth | 54 in |
| Hip Girth | 53 in |
| Foot Girth | 33 in |
| Compression or Stuff Sack | Stuff sack |
—Trish Matheny
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