Kapten & Son Helsinki 17L vs Knack Series 2 Small Expandable Pack
The Kapten & Son Helsinki 17L is 17L and 1.1kg2.4lb; the Knack Series 2 Small Expandable Pack is 17L and 1.08kg2.4lb. The Knack Series 2 Small Expandable Pack is 0.02kg0lb lighter. The Kapten & Son Helsinki 17L fits the carry-on limit of 36 of 36 major airlines and the Knack Series 2 Small Expandable Pack fits 36; under the seat, 1 and 7 of 26.
| Spec | Kapten & Son Helsinki 17L | Knack Series 2 Small Expandable Pack |
|---|---|---|
| Price | n/a | $225 |
| Volume | 17L | 17L |
| Expands to | n/a | 27L |
| Weight | 1.1kg2.4lb | 1.08kg2.4lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 4% | 27%Best |
| Dimensions | 46×26.5×14cm18×10.5×5.5in | 43.2×31.8×12.7cm17×12.5×5in |
| Laptop | 15.6" | 16"Best |
| Bottle pockets | n/a | 1 |
| Opening | Zipper | Clamshell, top-access laptop pocket, suitcase-style lid on packing compartment |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| 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 | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 47% PU, 50% recycled PET, 3% polyester | 420D high-density nylon with PU coating, 840D ballistic nylon bottom |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Kapten & Son Helsinki 17L | Knack Series 2 Small Expandable Pack |
|---|---|---|---|
| Allegiant Air | Personal item | Too big | Fits |
| American Airlines | Personal item | Too big | Fits |
| British Airways | Personal item | Too big | Fits |
| easyJet | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Volaris | Personal item | 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.