Here is how these two backpacks compare on the numbers. The Swift V takes a modest overall edge, led by low weight, but the Flash 55 has its own case.
| Six Moon Designs Swift V | REI Co-op Flash 55 | |
|---|---|---|
| GearScore | 65✓ | 62 |
| Capacity | 56 L | 55 L |
| Weight | 2 lb 4 oz✓ | 2 lb 13 oz |
| Rated load | 35 lb | 35 lb |
| Fabric denier | n/s | n/s |
| Price | $275 | $229✓ |
| Type | Ultralight | Backpacking |
| Frame | Internal | Internal |
Highlighted cells mark the better spec: Swift V in blue, Flash 55 in amber. A blank spec is never counted as a win. Capacity is shown for context and is not scored, since more volume is a sizing choice rather than better. GearScore is the overall rating (0 to 100); re-weight it on the full backpack comparison. Prices are current MSRP.
The Six Moon Designs Swift V against the REI Co-op Flash 55 is a study in priorities. The Swift V wins on low weight, and the Flash 55 pushes back on price.
The Swift V is 9 oz lighter. The Flash 55 is $46 cheaper. On the default GearScore the Swift V leads 65 to 62.
Pick the Swift V if you care most about low weight, which makes it the better call for counting grams on long miles. Pick the Flash 55 if price matter more to you, or you are focused on getting the most for your money.
The Six Moon Designs Swift V. It is 9 oz lighter than the Flash 55.
The REI Co-op Flash 55. It is $46 cheaper than the Swift V.
The Six Moon Designs Swift V, 65 to 62 on the default algorithm. You can re-weight the factors to match your trip.
It depends on your priorities. Go with the Swift V for low weight, or the Flash 55 for price. The spec table above shows exactly where each wins.