Here is how these two sleeping bags compare on the numbers. On the data the Magma 30 is the stronger all-round pick, and the question is whether the Light Quilt Convertible still fits your budget or priorities.
| REI Co-op Magma 30 | Zenbivy Light Quilt Convertible | |
|---|---|---|
| GearScore | 87✓ | 64 |
| Comfort rating | 34 °F✓ | 35 °F |
| Weight | 24.4 oz | 24.0 oz✓ |
| Warmth-to-weight | 5.2 /100g✓ | 5.1 /100g |
| Packed size | 4.3 L | n/s |
| Fill power | 850 FP✓ | 800 FP |
| Price | $379 | $309✓ |
| Fill | Down | Down |
| Style | Bag | Quilt |
| Shape | Mummy | Quilt |
Highlighted cells mark the better spec: Magma 30 in blue, Light Quilt Convertible 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.
The REI Co-op Magma 30 against the Zenbivy Light Quilt Convertible is a study in priorities. The Magma 30 is the stronger pick on most of the specs that matter, while the Light Quilt Convertible makes its case on low weight and price.
The Magma 30 is warmer (rated 34°F vs 35°F), stronger on warmth-to-weight, and higher fill power (850 vs 800). The Light Quilt Convertible is 1 oz lighter and $70 cheaper. On the default GearScore the Magma 30 leads 87 to 64.
Pick the Magma 30 if you care most about warmth and warmth-to-weight, which makes it the better call for colder nights and shoulder-season trips. Pick the Light Quilt Convertible if low weight and price matter more to you, or you are focused on counting grams on long miles.
The REI Co-op Magma 30. It is warmer (rated 34°F vs 35°F) than the Light Quilt Convertible.
The Zenbivy Light Quilt Convertible. It is 1 oz lighter than the Magma 30.
The REI Co-op Magma 30, 87 to 64 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 Light Quilt Convertible if low weight is your priority.