Here is how these two sleeping bags compare on the numbers. On the data the Flex 15 is the stronger all-round pick, and the question is whether the Apache MF still fits your budget or priorities.
| Katabatic Gear Flex 15 | Western Mountaineering Apache MF | |
|---|---|---|
| GearScore | 86✓ | 65 |
| Comfort rating | 25 °F | 25 °F |
| Weight | 26.8 oz✓ | 32.0 oz |
| Warmth-to-weight | 5.9 /100g✓ | 5.0 /100g |
| Packed size | 9.5 L | n/s |
| Fill power | 850 FP | 850 FP |
| Price | $429 | n/s |
| Fill | Down | Down |
| Style | Quilt | Bag |
| Shape | Quilt | Mummy |
Highlighted cells mark the better spec: Flex 15 in blue, Apache MF 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 Katabatic Gear Flex 15 against the Western Mountaineering Apache MF is a study in priorities. The Flex 15 is the stronger pick on most of the specs that matter, while the Apache MF makes its case on price.
The Flex 15 is 5 oz lighter and stronger on warmth-to-weight. On the default GearScore the Flex 15 leads 86 to 65.
Pick the Flex 15 if you care most about low weight and warmth-to-weight, which makes it the better call for counting grams on long miles. Pick the Apache MF if you would rather save the difference.
The Katabatic Gear Flex 15. It is 5 oz lighter than the Apache MF.
The Katabatic Gear Flex 15. It is stronger on warmth-to-weight than the Apache MF.
The Katabatic Gear Flex 15, 86 to 65 on the default algorithm. You can re-weight the factors to match your trip.
The Flex 15 is the stronger all-round pick here. Choose the Apache MF if it is the better value for you.