Alpha One Niner Spare Camel 2.0 Backpack vs Mountainsmith Mayhem EVO 30L Backpack
The Alpha One Niner Spare Camel 2.0 Backpack is 30L and 1.77kg3.9lb; the Mountainsmith Mayhem EVO 30L Backpack is 29L and 1.76kg3.9lb. The Mountainsmith Mayhem EVO 30L Backpack is 0.01kg0lb lighter. The Mountainsmith Mayhem EVO 30L Backpack costs $55.05000000000001 less. The Alpha One Niner Spare Camel 2.0 Backpack fits the carry-on limit of 35 of 36 major airlines and the Mountainsmith Mayhem EVO 30L Backpack fits 15; under the seat, 0 and 0 of 26.
| Spec | Alpha One Niner Spare Camel 2.0 Backpack | Mountainsmith Mayhem EVO 30L Backpack |
|---|---|---|
| Price | $295 | $239.95Best |
| Volume | 30L | 29L |
| Weight | 1.77kg3.9lb | 1.76kg3.9lbBest |
| Carry-on compliance | 97%Best | 42% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 52×32×19.5cm20.5×12.5×7.5in | 55.9×26.7×17.8cm22×10.5×7in |
| Laptop | sleeve, size not published | no laptop sleeve |
| Bottle pockets | n/a | 2 |
| Compression straps | 2 | n/a |
| Opening | main compartment zip, clamshell laptop compartment, front zip pocket behind the loop patch | Clamshell, Hybrid panel and top loader with wide clamshell style zippered main compartment |
| Warranty | 5 years | Lifetime |
| Torso length | n/a | 38.1 to 48.3cm (15 to 19in) |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | Removable |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | Yes | Yes |
| Hip belt | Insert sold separately | Yes |
| Sternum strap | Yes | Yes |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | Dimension-Polyant X50 Tactical with Brookwood Squadron laser cut PALS panel and 210D ripstop nylon lining, YKK RC zippers, WooJin hardware | 420D nylon ripstop dobby with DWR, 150D high density polyester liner, YKK zippers |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Alpha One Niner Spare Camel 2.0 Backpack | Mountainsmith Mayhem EVO 30L Backpack |
|---|---|---|---|
| Air Arabia | Carry-on | Fits | Too big |
| Air Canada | Carry-on | Fits | Too big |
| Air France | Carry-on | Fits | Too big |
| Air India | Carry-on | Fits | Too big |
| Allegiant Air | Carry-on | Fits | Too big |
| ANA (All Nippon Airways) | Carry-on | Fits | Too big |
| Avianca | Carry-on | Fits | Too big |
| Emirates | Carry-on | Fits | Too big |
| Gol Linhas Aereas | Carry-on | Fits | Too big |
| IndiGo | Carry-on | Fits | Too big |
| KLM | Carry-on | Fits | Too big |
| LATAM Airlines | Carry-on | Fits | Too big |
| Lufthansa | Carry-on | Fits | Too big |
| Norwegian Air Shuttle | Carry-on | Fits | Too big |
| Ryanair | Carry-on | Fits | Too big |
| SAS | Carry-on | Fits | Too big |
| Turkish Airlines | Carry-on | Fits | Too big |
| Volaris | Carry-on | Fits | Too big |
| Vueling | Carry-on | Fits | Too big |
| Wizz Air | Carry-on | Fits | Too big |
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Specs come from each brand's own product page. Fit uses listed dimensions in any orientation. How we score carry-on fit.