A close look at two backpacks buyers cross-shop. Both are solid; the right one depends on the specs you care about most.
| Arc'teryx Alpha AR 55 | REI Co-op Flash 55 | |
|---|---|---|
| GearScore | 64✓ | 62 |
| Capacity | 55 L | 55 L |
| Weight | 2 lb 14 oz | 2 lb 13 oz✓ |
| Rated load | n/s | 35 lb |
| Fabric denier | 315 D | n/s |
| Price | $250 | $229✓ |
| Type | Backpacking | Backpacking |
| Frame | Internal | Internal |
Highlighted cells mark the better spec: Alpha AR 55 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.
Put the Arc'teryx Alpha AR 55 next to the REI Co-op Flash 55 and the trade-offs are clear. The Alpha AR 55 wins on balance, and the Flash 55 pushes back on low weight and price.
The Flash 55 is 1 oz lighter and $21 cheaper. Their GearScores land within a couple of points (64 vs 62), so neither runs away with it.
Pick the Alpha AR 55 if you care most about the overall package. Pick the Flash 55 if low weight and price matter more to you, or you are focused on counting grams on long miles.
The REI Co-op Flash 55. It is 1 oz lighter than the Alpha AR 55.
The REI Co-op Flash 55. It is $21 cheaper than the Alpha AR 55.
They are nearly tied at 64 and 62 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 Alpha AR 55 for the overall balance, or the Flash 55 for low weight. The spec table above shows exactly where each wins.