Kapten & Son Lisbon Duffle Backpack Medium 50L vs Knack Large Expandable Travel Duffel
The Kapten & Son Lisbon Duffle Backpack Medium 50L is 50L and 1.8kg4lb; the Knack Large Expandable Travel Duffel is 50L and 1.73kg3.8lb. The Knack Large Expandable Travel Duffel is 0.07kg0.2lb lighter. The Kapten & Son Lisbon Duffle Backpack Medium 50L fits the carry-on limit of 0 of 36 major airlines and the Knack Large Expandable Travel Duffel fits 0; under the seat, 0 and 0 of 26.
| Spec | Kapten & Son Lisbon Duffle Backpack Medium 50L | Knack Large Expandable Travel Duffel |
|---|---|---|
| Price | n/a | $185 |
| Volume | 50L | 50L |
| Expands to | n/a | 73L |
| Weight | 1.8kg4lb | 1.73kg3.8lbBest |
| Carry-on compliance | 0% | 0% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 30×55×34.5cm12×21.5×13.5in | 38.1×55.9×30.5cm15×22×12in |
| Laptop | 15.6" | no laptop sleeve |
| Opening | Zipper | zip top |
| Organizer | Yes | Yes |
| Shoe compartment | Yes | Yes |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | Yes | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | Removable |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 88% recycled PET, 8% PU, 4% polyester | Water-resistant 900 x 1200 denier high-twist high-density polyester, 150D antimicrobial nylon lining |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
Both bags pass and fail the same airline size limits.
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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.