Kapten & Son Lisbon Duffle Backpack Medium 50L vs KNKG CORE PRO Duffel Large 51L
The Kapten & Son Lisbon Duffle Backpack Medium 50L is 50L and 1.8kg4lb; the KNKG CORE PRO Duffel Large 51L is 51L and 1.8kg4lb. They weigh the same. The Kapten & Son Lisbon Duffle Backpack Medium 50L fits the carry-on limit of 0 of 36 major airlines and the KNKG CORE PRO Duffel Large 51L fits 1; under the seat, 0 and 0 of 26.
| Spec | Kapten & Son Lisbon Duffle Backpack Medium 50L | KNKG CORE PRO Duffel Large 51L |
|---|---|---|
| Price | n/a | $240 |
| Volume | 50L | 51L |
| Weight | 1.8kg4lb | 1.8kg4lb |
| Carry-on compliance | 0% | 3%Best |
| Personal-item compliance | 0% | 0% |
| Dimensions | 30×55×34.5cm12×21.5×13.5in | 32×50.8×32cm12.5×20×12.5in |
| Laptop | 15.6" | 16"Best |
| Bottle pockets | n/a | 2 |
| Opening | Zipper | Zippered main compartment |
| Warranty | n/a | 25 years |
| Organizer | Yes | No |
| Shoe compartment | Yes | Yes |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | Yes |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 88% recycled PET, 8% PU, 4% polyester | 500D nylon body (PVC backing), ripstop nylon internal lining, YKK zippers, powder-coated steel hardware |
| Last checked | 2026-10 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Kapten & Son Lisbon Duffle Backpack Medium 50L | KNKG CORE PRO Duffel Large 51L |
|---|---|---|---|
| Singapore Airlines | Carry-on | Too big | Fits |
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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.