Alpha One Niner Evade 1.5 Backpack, Gen 3 vs Kapten & Son Helsinki Pro Bike 23L
The Alpha One Niner Evade 1.5 Backpack, Gen 3 is 25L and 1.7kg3.7lb; the Kapten & Son Helsinki Pro Bike 23L is 23L and 1.7kg3.7lb. They weigh the same. The Alpha One Niner Evade 1.5 Backpack, Gen 3 fits the carry-on limit of 36 of 36 major airlines and the Kapten & Son Helsinki Pro Bike 23L fits 35; under the seat, 0 and 0 of 26.
| Spec | Alpha One Niner Evade 1.5 Backpack, Gen 3 | Kapten & Son Helsinki Pro Bike 23L |
|---|---|---|
| Price | $249 | n/a |
| Volume | 25L | 23L |
| Weight | 1.7kg3.7lb | 1.7kg3.7lb |
| Carry-on compliance | 100%Best | 97% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 47×30×18cm18.5×12×7in | 52×30×15.5cm20.5×12×6in |
| Laptop | 16"Best | 15.6" |
| Compartments | 4 | n/a |
| Bottle pockets | 2 | n/a |
| Opening | Top-loading, top zip | Zipper |
| Warranty | 5 years | n/a |
| Organizer | Yes | No |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | Yes |
| MOLLE | Yes | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | Challenge Ultra 400TX, Dimension-Polyant X42, or 500D Nylon with 200D UHMWPE ripstop nylon lining | 58% PU, 39% recycled PET, 3% polyester |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Alpha One Niner Evade 1.5 Backpack, Gen 3 | Kapten & Son Helsinki Pro Bike 23L |
|---|---|---|---|
| Qatar Airways | 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.