How to Choose Sleeping Bags for Backpacking
REI Co-op Magma 30 Sleeping Bag
$379.00
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The updated REI Co-op Magma 30 sleeping bag ensures comfort and toasty warmth without adding extra weight. An extended range of sizes delivers your best fit for better sleep—all under 2 lbs.
Key Details
Fill
850-fill-power water-resistant goose down (bluesign approved)
Weight
Short Narrow: 1 lb. 5.6 oz.
Short: 1 lb. 6.8 oz.
Short Wide: 1 lb. 8.4 oz.
Medium Narrow: 1 lb. 6.9 oz.
Medium: 1 lb. 8.4 oz.
Medium Wide: 1 lb. 10 oz.
Long Narrow: 1 lb. 9 oz.
Long: 1 lb. 10.1 oz.
Long Wide: 1 lb. 11.8 oz.
Compressed Volume
Short Narrow: 3.6 liters
Short: 3.7 liters
Short Wide: 4.2 liters
Medium Narrow: 4 liters
Medium: 4.3 liters
Medium Wide: 4.7 liters
Long Narrow: 4.2 liters
Long: 4.7 liters
Long Wide: 5.2 liters
Temperature Rating (F)
30 degrees (F)
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- Inclusive sizing lets you find your best fit based on body shape and sleeping preferences
- Light-but-not-tight performance fit contours to your body shape; fitted throughout to reduce weight and increase thermal efficiency
- Recycled downproof shell, water-resistant 850-fill-power goose down and supple recycled lining combine to provide cozy warmth and a supersoft feel
- Nonfluorinated durable water repellent (DWR) finish on the shell and lining helps moisture bead up on the surface
- Hood has contoured shape to fit securely around your head and cinches up for maximum warmth; 2 differentiated drawcords make it easy to adjust while you're zipped in the bag
- Variable baffle spacing locates and stabilizes the down fill, delivering thermal efficiency and reducing weight
- Zipper path wraps around the front of your chest so you can more easily zip and unzip the bag; zipper cover and internal antisnag strip allow for frustration-free zipping
- Trapezoidal footbox has room to move your feet while reducing excess space to increase warmth and decrease weight
- Insulated yoke fills the neck and shoulder gap to prevent heat loss
- Keep personal items close and easy to access in the interior stash pocket
- Includes a stuff sack for packing and a roomy mesh sack for breathable storage
- Hand-wash or machine wash warm, gentle cycle in front-load washer only; do not bleach; rinse thoroughly; do not wring; air dry or tumble dry low; do not iron or dry clean
- 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 | 24 degrees (F) - ISO |
| Tested Comfort | 34 degrees (F) - ISO |
| Temperature Rating (F) | 30 degrees (F) |
| Temperature Rating (C) | -9 degrees (C) |
| Weight | Short Narrow: 1 lb. 5.6 oz. Short: 1 lb. 6.8 oz. Short Wide: 1 lb. 8.4 oz. Medium Narrow: 1 lb. 6.9 oz. Medium: 1 lb. 8.4 oz. Medium Wide: 1 lb. 10 oz. Long Narrow: 1 lb. 9 oz. Long: 1 lb. 10.1 oz. Long Wide: 1 lb. 11.8 oz. |
| Shell | 15-denier recycled ripstop nylon (bluesign approved) |
| Zipper Location | Left |
| Insulation Type | Down |
| Water-Resistant Down | Yes |
| Fill | 850-fill-power water-resistant goose down (bluesign approved) |
| Fill Weight | Short Narrow: 10.8 ounces Short: 11.5 ounces Short Wide: 12.4 ounces Medium Narrow: 11.9 ounces Medium: 12.7 ounces Medium Wide: 13.7 ounces Long Narrow: 13.1 ounces Long: 13.9 ounces Long Wide: 14.7 ounces |
| Sleeping Capacity | 1-person |
| Lining | 15-denier recycled ripstop nylon (bluesign approved) |
| Sleeping Bag Shape | Mummy |
| Fits Up To (in.) | Short Narrow: 65 inches Short: 65 inches Short Wide: 65 inches Medium Narrow: 71 inches Medium: 71 inches Medium Wide: 71 inches Long Narrow: 77 inches Long: 77 inches Long Wide: 77 inches |
| Shoulder Girth (in.) | Short Narrow: 54 inches Short: 61.5 inches Short Wide: 69 inches Medium Narrow: 55 inches Medium: 62.5 inches Medium Wide: 70 inches Long Narrow: 56 inches Long: 63.5 inches Long Wide: 71 inches |
| Hip Girth (in.) | Short Narrow: 45.5 inches Short: 53 inches Short Wide: 61.5 inches Medium Narrow: 46.5 inches Medium: 54 inches Medium Wide: 62.5 inches Long Narrow: 47.5 inches Long: 55 inches Long Wide: 63.5 inches |
| Stuff Sack Size | Short Narrow: 6 x 14 inches Short: 6 x 14 inches Short Wide: 6 x 14 inches Medium Narrow: 6 x 14 inches Medium: 7 x 15 inches Medium Wide: 7 x 15 inches Long Narrow: 7 x 15 inches Long: 7 x 15 inches Long Wide: 7 x 15 inches |
| Stuff Sack Volume | Short Narrow: 5 liters Short: 5 liters Short Wide: 5 liters Medium Narrow: 5 liters Medium: 7.5 liters Medium Wide: 7.5 liters Long Narrow: 7.5 liters Long: 7.5 liters Long Wide: 7.5 liters |
| Compressed Volume | Short Narrow: 3.6 liters Short: 3.7 liters Short Wide: 4.2 liters Medium Narrow: 4 liters Medium: 4.3 liters Medium Wide: 4.7 liters Long Narrow: 4.2 liters Long: 4.7 liters Long Wide: 5.2 liters |
| Gender | Unisex |
| Sustainability | Contains recycled materials Contains materials that meet the bluesign® criteria From a Climate Label Certified brand |
Hip Girth The circumference at the widest point of your hips. | |||
|---|---|---|---|
| 39-45 | 32-39 | 45-52 | |
| Height | |||
| 4'11'-5'5'' | Short | Short Narrow | Short Wide |
| 5'5''-5'11'' | Medium | Medium Narrow | Medium Wide |
| 5'11''-6'5'' | Long | Long Narrow | Long Wide |
Sizing Notes
Measurements are stated in inches unless otherwise indicated. For Hip measurement, measure around your body at the widest point of your hip. If right at the edge of the measurements listed, size up or down based on your upper body size or how you prefer your sleeping bag to fit. A closer fit will provide better insulation, and a looser fit will allow for a bit more room. It’s important to not have too much room for proper insulation.
