REI Co-op Magma 30 Review
Cons: Moderate warmth
Manufacturer: REI Co-op
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REI Co-op Magma 30
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|$459.00 at Feathered Friends||$200 List|
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|$399.95 at Backcountry|
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|Pros||Lightweight, small packed size, quality down, nice zipper, cozy fabric||Super lightweight, incredible loft, snag-proof zipper, cozy hood||Decent weight, respectable warmth, awesome bargain||Spacious, decent warmth-to-weight ratio, reasonable price||Great price, respectable weight, simple design|
|Cons||Moderate warmth||Uncomfortably narrow dimensions, bare-bones design, noisy fabric||Average materials, limited features, basic design||Bulky, ineffective hood closure, limited versatility||Subpar warmth, annoying hood drawcords, no storage sack, mediocre versatility|
|Bottom Line||An awesome bag at a fair price||Our favorite when ounces matter, this is a full-size mummy bag that's both warm and ultralight||An exceptional deal for a capable and sturdy backpacking sleeping bag for those looking to get outside without breaking the bank||A mid-range double bag for weight-conscious and comfort-seeking adventure pairs||An 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...|
|Packed Size (15%)|
|Features & Design (10%)|
|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|
|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|
|Liner material||15-denier ripstop nylon||n/a||30D Plain weave nylon||Polyester taffeta||Polyester|
|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
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.
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.
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.
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.
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.
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.
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.
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