Here is how these two backpacks compare on the numbers. The Arc Haul Ultra 60 takes a modest overall edge, led by low weight, but the Unbound 55 has its own case.
| Zpacks Arc Haul Ultra 60 | Hyperlite Mountain Gear Unbound 55 | |
|---|---|---|
| GearScore | 73✓ | 68 |
| Capacity | 60 L | 55 L |
| Weight | 1 lb 6 oz✓ | 1 lb 13 oz |
| Rated load | 40 lb | 40 lb |
| Fabric denier | 100 D | n/s |
| Price | $399✓ | $420 |
| Type | Ultralight | Ultralight |
| Frame | Internal | Internal |
Highlighted cells mark the better spec: Arc Haul Ultra 60 in blue, Unbound 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 Zpacks Arc Haul Ultra 60 against the Hyperlite Unbound 55 is a study in priorities. The Arc Haul Ultra 60 wins on low weight and price, and the Unbound 55 pushes back on value.
The Arc Haul Ultra 60 is 7 oz lighter and $21 cheaper. On the default GearScore the Arc Haul Ultra 60 leads 73 to 68.
Pick the Arc Haul Ultra 60 if you care most about low weight and price, which makes it the better call for counting grams on long miles. Pick the Unbound 55 if you would rather save the difference.
The Zpacks Arc Haul Ultra 60. It is 7 oz lighter than the Unbound 55.
The Zpacks Arc Haul Ultra 60. It is $21 cheaper than the Unbound 55.
The Zpacks Arc Haul Ultra 60, 73 to 68 on the default algorithm. You can re-weight the factors to match your trip.
It depends on your priorities. Go with the Arc Haul Ultra 60 for low weight, or the Unbound 55 for the price. The spec table above shows exactly where each wins.