Here is how these two sleeping bags compare on the numbers. The Sawatch 15 takes a modest overall edge, led by low weight, but the Flex 15 has its own case.
| Katabatic Gear Sawatch 15 | Katabatic Gear Flex 15 | |
|---|---|---|
| GearScore | 87✓ | 86 |
| Comfort rating | 25 °F | 25 °F |
| Weight | 26.0 oz✓ | 26.8 oz |
| Warmth-to-weight | 6.1 /100g✓ | 5.9 /100g |
| Packed size | 8.0 L✓ | 9.5 L |
| Fill power | 850 FP | 850 FP |
| Price | $419✓ | $429 |
| Fill | Down | Down |
| Style | Quilt | Quilt |
| Shape | Quilt | Quilt |
Highlighted cells mark the better spec: Sawatch 15 in blue, Flex 15 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 Sawatch 15 against the Katabatic Gear Flex 15 is a study in priorities. The Sawatch 15 wins on low weight and warmth-to-weight, and the Flex 15 pushes back on value.
The Sawatch 15 is 1 oz lighter, stronger on warmth-to-weight, and more packable (8 L vs 9.5 L). Their GearScores land within a couple of points (87 vs 86), so neither runs away with it.
Pick the Sawatch 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 Flex 15 if you would rather save the difference.
The Katabatic Gear Sawatch 15. It is 1 oz lighter than the Flex 15.
The Katabatic Gear Sawatch 15. It is stronger on warmth-to-weight than the Flex 15.
They are nearly tied at 87 and 86 on the default algorithm, so re-weight the score to your own priorities to break the tie.
It depends on your priorities. Go with the Sawatch 15 for low weight, or the Flex 15 for the price. The spec table above shows exactly where each wins.