A close look at two sleeping bags buyers cross-shop. On the data the Magma 30 is the stronger all-round pick, and the question is whether the Hydrogen 30 still fits your budget or priorities.
| REI Co-op Magma 30 | Marmot Hydrogen 30 | |
|---|---|---|
| GearScore | 87✓ | 63 |
| Comfort rating | 34 °F✓ | 36 °F |
| Weight | 24.4 oz✓ | 25.4 oz |
| Warmth-to-weight | 5.2 /100g✓ | 4.7 /100g |
| Packed size | 4.3 L | n/s |
| Fill power | 850 FP✓ | 800 FP |
| Price | $379✓ | $429 |
| Fill | Down | Down |
| Style | Bag | Bag |
| Shape | Mummy | Mummy |
Highlighted cells mark the better spec: Magma 30 in blue, Hydrogen 30 in amber. A blank spec is never counted as a win. A lower comfort rating in °F means a warmer bag, so the warmer bag takes that row. GearScore is the overall rating (0 to 100); re-weight it on the full bag comparison. Prices are current MSRP.
Put the REI Co-op Magma 30 next to the Marmot Hydrogen 30 and the trade-offs are clear. The Magma 30 is the stronger pick on most of the specs that matter, while the Hydrogen 30 makes its case on price.
The Magma 30 is warmer (rated 34°F vs 36°F), 1 oz lighter, and stronger on warmth-to-weight. On the default GearScore the Magma 30 leads 87 to 63.
Pick the Magma 30 if you care most about warmth and low weight, which makes it the better call for colder nights and shoulder-season trips. Pick the Hydrogen 30 if you would rather save the difference.
The REI Co-op Magma 30. It is warmer (rated 34°F vs 36°F) than the Hydrogen 30.
The REI Co-op Magma 30. It is 1 oz lighter than the Hydrogen 30.
The REI Co-op Magma 30, 87 to 63 on the default algorithm. You can re-weight the factors to match your trip.
The Magma 30 is the stronger all-round pick here. Choose the Hydrogen 30 if it is the better value for you.