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REI Co-op Magma 30 Review

An awesome bag at a fair price
REI Co-op Magma 30
Photo: REI Co-op
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Price:  $339 List | Check Price at REI
Pros:  Lightweight, small packed size, quality down, nice zipper, cozy fabric
Cons:  Moderate warmth
Manufacturer:   REI Co-op
By Jack Cramer ⋅ Review Editor  ⋅  Oct 16, 2019
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71
OVERALL
SCORE


RANKED
#7 of 21
  • Warmth - 20% 5
  • Weight - 20% 9
  • Comfort - 20% 8
  • Packed Size - 15% 8
  • Versatility - 15% 6
  • Features & Design - 10% 6

Our Verdict

Lava deep underground is called magma. A sleeping bag that's unlikely to stay underground is the REI Co-op Magma 30. That's because this awesome bag is poised to become massively popular. On paper it has impressive specs: 850 fill power down in a 30°F bag that weighs just 1 lb 4 oz. Our hands-on test also confirmed that it achieves this low weight and respectable warmth without compromising comfort or versatility. Overall, the Magma isn't as good as our favorite models from Western Mountaineering and Feathered Friends, but it comes close. At the same time, the Magma has a more reasonable price tag, and its availability at REI means that you're much more likely to find it on sale. We thus recommend the Magma for dedicated backpackers or other weight-conscious travelers looking for a good bargain on a top-performing sleeping bag.

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REI Co-op Magma 30
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REI Co-op Magma 30
Awards  Top Pick Award Best Buy Award Best Buy Award Best Buy Award 
Price $339 List
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$459.00 at Feathered Friends$200 List
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$399.95 at Backcountry
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Overall Score Sort Icon
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Star Rating
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Pros Lightweight, small packed size, quality down, nice zipper, cozy fabricSuper lightweight, incredible loft, snag-proof zipper, cozy hoodDecent weight, respectable warmth, awesome bargainSpacious, decent warmth-to-weight ratio, reasonable priceGreat price, respectable weight, simple design
Cons Moderate warmthUncomfortably narrow dimensions, bare-bones design, noisy fabricAverage materials, limited features, basic designBulky, ineffective hood closure, limited versatilitySubpar warmth, annoying hood drawcords, no storage sack, mediocre versatility
Bottom Line An awesome bag at a fair priceOur favorite when ounces matter, this is a full-size mummy bag that's both warm and ultralightAn exceptional deal for a capable and sturdy backpacking sleeping bag for those looking to get outside without breaking the bankA mid-range double bag for weight-conscious and comfort-seeking adventure pairsAn acceptable sleeping bag at a rock bottom price
Rating Categories REI Co-op Magma 30 Hummingbird UL 30 Bishop Pass 30 Big Agnes Sentinel... REI Co-op Trailbrea...
Warmth (20%)
5.0
8.0
6.0
5.0
5.0
Weight (20%)
9.0
9.0
6.0
7.0
3.0
Comfort (20%)
8.0
7.0
6.0
7.0
6.0
Packed Size (15%)
8.0
8.0
8.0
8.0
5.0
Versatility (15%)
6.0
8.0
6.0
4.0
7.0
Features & Design (10%)
6.0
7.0
6.0
7.0
6.0
Specs REI Co-op Magma 30 Hummingbird UL 30 Bishop Pass 30 Big Agnes Sentinel... REI Co-op Trailbrea...
Insulation 850 FP Down 950+ FP Down 650 FP Down, RDS-certified 650 FP Down Synthetic - Polyester
Compressed Volume (L) 6.7 L 7.3 L 7.5 L 11.2 L 9.8 L
Measured Bag Weight (Size Long) 1.39 lbs 1.45 lbs 1.98 lbs 3.25 lbs (size regular) 2.74 lbs
Manufacturer claimed weight of size Regular (lbs) 1.24 lbs 1.33 lbs 1.79 lbs 3.5 lbs 2.5 lb
Compression/Stuff Sack Weight (oz) 0.4 oz 0.8 oz 1.6 oz 1.4 oz 1.2 oz
Hydrophobic down Yes No No Yes N/A
Manufacturer Temp Rating (F) 30 F 30 F 30 F 30 F 30 F
EN Temp Rating (Lower Limit, F) 30 F Not rated 30 F Not rated 29 F
Fill Weight (oz) 9.7 oz 12 oz 15 oz 19.5 oz 21.1 oz
Compression or stuff sack included? Stuff Stuff Stuff sack Stuff sack Stuff
Shell material Pertex ripstop nylon (15D) Pertex Endurance (10D) 20D Nylon Ripstop Polyester ripstop Polyester w/ DWR
DWR? No Yes Yes Yes No
Liner material 15-denier ripstop nylon n/a 30D Plain weave nylon Polyester taffeta Polyester
Neck Baffle Yes No No Yes No
Small Organization Pocket No No Yes No Yes
Zipper 3/4-length / Side Full-length / Side 3/4-length / Left Side Dual 3/4-length 3/4-Length / Left Side
Shoulder Girth (in) 63 58 62 105 62
Hip Girth (in) 57 52 53 105 56
Foot Girth (in) Not stated 38 84 Not stated

Our Analysis and Test Results

Performance Comparison


A premium sleeping bag doesn't have to come with an astronomical...
A premium sleeping bag doesn't have to come with an astronomical pricetag. Case in point, the REI Magma 30.
Photo: Jack Cramer

Warmth


The Magma is filled with 9.7 ounces of 850 fill power goose down. Although this down is undeniably high-quality, that's a fairly small amount for a bag with a 30°F temperature rating. Nevertheless, our testers believe this moderate rating is accurate. Helping it retain body heat is the legit draft collar that seals heat in on cooler nights. The Magma may not keep you lava hot, but it's certainly warm enough for most 3-season uses.

The orange neck baffle shown here is great at preventing warmth from...
The orange neck baffle shown here is great at preventing warmth from escaping out the hood on cold nights.
Photo: Jack Cramer

Weight


A size long weighed in on our scale at 1.39 pounds, impressively light for a 30° mummy bag with a full-length zipper. Its drawstring stuff sack also tipped our scale at an ultralight 0.4 ounces. Together they combine for an overnight combo that's noticeably lighter than several bags that offer similar warmth but cost as much as a hundred dollars more.

A subtle comfort enhancement is the small triangle of grey fabric...
A subtle comfort enhancement is the small triangle of grey fabric redirects the zipper away from your slumbering face.
Photo: Jack Cramer

Comfort


The Magma scores pretty well on comfort. Its 63-inch shoulder girth is almost the widest we tested, and it only tapers modestly toward the foot of the bag. This left our testers with generous interior dimensions to enjoy. We also appreciated this bag's cozy 15-denier ripstop nylon material. Finally, it's easy to overlook the triangle-shaped piece of fabric at the end of the zipper, but the excellent job it does of shielding your face from the cold metal of the zipper's slide should not be ignored.

The upside of the Magma's stuff sack is that its extremely...
The upside of the Magma's stuff sack is that its extremely light--just 0.4 oz. The downside is that it doesn't compress the bag particularly well.
Photo: Jack Cramer

Packed Size


As its low weight would suggest, this bag packs down super well. Stuffed inside a third-party compression sack, we measured its minimum volume at 6.7 liters. That's nearly the smallest in the backpacking sleeping bag field. Unfortunately, you can't achieve this minimal size using the simple drawstring stuff sack that it comes with. So if packed size is important to you, expect to spend a few extra dollars getting a good after-market compression sack.

Versatility


All down insulation underperforms if it gets wet, and the Magma is no different. This limits its usefulness in wet conditions, but in most situations, it's possible to keep it dry and performing well. The range of temperatures you can comfortably use it in is enhanced by the full-length zipper and draft collar. The long zipper lets you vent excess heat on warmer nights while the draft collar helps trap heat inside on colder evenings.

The grey pull tab on the inside of the zipper is a nice touch which...
The grey pull tab on the inside of the zipper is a nice touch which ensures that escaping the bag isn't a struggle.
Photo: Jack Cramer

Features and Design


As far as traditional mummy bags go, the Magma is designed pretty well. The strongest evidence for this is the respectable warmth it provides in such a lightweight package. Aside from that, however, it has limited noteworthy features. It lacks a stash pocket to store your phone, and it can't boast of any versatility boosting accessory. We do really like its zipper, which is anti-snag and includes a pull tab on the inside for a more convenient escape.

Value


The Magma is REI's premium sleeping bag offering. Although its price tag is higher than one might expect for a store-brand model, we still think it provides excellent value. Performance-wise there are a few ultra-premium bags from Feathered Friends and Western Mountaineering that we like more, but the Magma costs noticeably less. Its availability at REI also means that you're much more likely to find it on sale.

There a few other sleeping bags that we prefer slightly over the REI...
There a few other sleeping bags that we prefer slightly over the REI Magma 30, but there isn't a better deal on an lightweight premium bag.
Photo: Jack Cramer

Conclusion


Today, more and more big-name companies are making sleeping bags with 850 fill power down or higher. Our testers have been underwhelmed with the offerings from many of these new entrants, but that's not the case with the REI Magma 30. Although its performance didn't quite reach the pinnacle of the backpacking sleeping bag category, it came darn close. Getting one at REI is also a lot more convenient than a custom order from a specialty manufacturer and improves the likelihood that you could find it on sale. If you're lucky and do find it marked down, don't hesitate to pull the trigger.

Jack Cramer