CALPAK Luka 17 inch Laptop Backpack vs Six Moon Designs Flight 30 Ultra Running Backpack
The CALPAK Luka 17 inch Laptop Backpack is 30.6L and 0.91kg2lb; the Six Moon Designs Flight 30 Ultra Running Backpack is 31L and 0.88kg1.9lb. The Six Moon Designs Flight 30 Ultra Running Backpack is 0.03kg0.1lb lighter. The CALPAK Luka 17 inch Laptop Backpack costs $52 less. The CALPAK Luka 17 inch Laptop Backpack fits the carry-on limit of 32 of 36 major airlines and the Six Moon Designs Flight 30 Ultra Running Backpack fits 36; under the seat, 0 and 8 of 26.
| Spec | CALPAK Luka 17 inch Laptop Backpack | Six Moon Designs Flight 30 Ultra Running Backpack |
|---|---|---|
| Price | $148Best | $200 |
| Volume | 30.6L | 31L |
| Weight | 0.91kg2lb | 0.88kg1.9lbBest |
| Carry-on compliance | 89% | 100%Best |
| Personal-item compliance | 0% | 31%Best |
| Dimensions | 45.7×33×20.3cm18×13×8in | 43×28×18cm17×11×7in |
| Laptop | 17" | no laptop sleeve |
| Compartments | n/a | 1 |
| Opening | n/a | Top-loading, Top loading with dry bag closure |
| Warranty | n/a | No fixed term |
| Torso length | n/a | 38 to 56cm (15 to 22in) |
| Sizes | n/a | Small, Large |
| Organizer | Yes | No |
| Shoe compartment | Yes | No |
| Hydration sleeve | No | Yes |
| Frame sheet | No | No |
| Water-resistant | Yes | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | Removable |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Material | Polyester | 100D Robic nylon (price shown) or EPX200 body, EPX200 side panels, 3D mesh back, Challenge Ultra Stretch pockets |
| Last checked | 2026-10 | 2026-09 |
Where their airline fit differs
| Airline | Limit | CALPAK Luka 17 inch Laptop Backpack | Six Moon Designs Flight 30 Ultra Running Backpack |
|---|---|---|---|
| Air Arabia | Carry-on | Too big | Fits |
| Air India | Carry-on | Too big | Fits |
| 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 |
| Frontier Airlines | Personal item | Too big | Fits |
| JetBlue Airways | Personal item | Too big | Fits |
| LATAM Airlines | Personal item | Too big | Fits |
| Ryanair | Carry-on | Too big | Fits |
| Volaris | Personal item | Too big | Fits |
| Vueling | 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.