Two backpacks worth lining up side by side. The Exos Pro 55 leans on load carry while the Flash Air 50 answers with low weight, so the pick comes down to which you value.
| Osprey Exos Pro 55 | REI Co-op Flash Air 50 | |
|---|---|---|
| GearScore | 67✓ | 63 |
| Capacity | 55 L | 50 L |
| Weight | 2 lb 1 oz | 1 lb 14 oz✓ |
| Rated load | 30 lb✓ | 25 lb |
| Fabric denier | 100 D | n/s |
| Price | $330 | $299✓ |
| Type | Ultralight | Ultralight |
| Frame | Internal | Internal |
Highlighted cells mark the better spec: Exos Pro 55 in blue, Flash Air 50 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 Osprey Exos Pro 55 and REI Co-op Flash Air 50 take different routes to the same job. The Exos Pro 55 wins on load carry, and the Flash Air 50 pushes back on low weight and price.
The Exos Pro 55 is a higher rated load (30 vs 25 lb). The Flash Air 50 is 3 oz lighter and $31 cheaper. On the default GearScore the Exos Pro 55 leads 67 to 63.
Pick the Exos Pro 55 if you care most about load carry, which makes it the better call for rough ground and hard use. Pick the Flash Air 50 if low weight and price matter more to you, or you are focused on counting grams on long miles.
The Osprey Exos Pro 55. It is a higher rated load (30 vs 25 lb) than the Flash Air 50.
The REI Co-op Flash Air 50. It is 3 oz lighter than the Exos Pro 55.
The Osprey Exos Pro 55, 67 to 63 on the default algorithm. You can re-weight the factors to match your trip.
It depends on your priorities. Go with the Exos Pro 55 for load carry, or the Flash Air 50 for low weight. The spec table above shows exactly where each wins.