Aer Pro Pack Slim vs Billykirk No. 609 Standard Issue Backpack Tote
The Aer Pro Pack Slim is 12.5L and 0.86kg1.9lb; the Billykirk No. 609 Standard Issue Backpack Tote is 12.6L and 0.82kg1.8lb. The Billykirk No. 609 Standard Issue Backpack Tote is 0.04kg0.1lb lighter. The Aer Pro Pack Slim costs $141 less. The Aer Pro Pack Slim fits the carry-on limit of 36 of 36 major airlines and the Billykirk No. 609 Standard Issue Backpack Tote fits 36; under the seat, 9 and 10 of 26.
| Spec | Aer Pro Pack Slim | Billykirk No. 609 Standard Issue Backpack Tote |
|---|---|---|
| Price | $139Best | $280 |
| Volume | 12.5L | 12.6L |
| Weight | 0.86kg1.9lb | 0.82kg1.8lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 35% | 38%Best |
| Dimensions | 43×30.5×10cm17×12×4in | 40.6×30.5×10.2cm16×12×4in |
| Laptop | 16"Best | 15" |
| Bottle pockets | 1 | n/a |
| Warranty | Lifetime | 5 years |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Material | 840D CORDURA re/cor recycled nylon exterior (bluesign approved), recycled nylon lining (bluesign approved), YKK zippers, Duraflex hardware | 10.10 oz waxed canvas, premium vegetable tanned leather, 1 in nylon tubular webbing handle, matte nickel-plated brass hardware |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Aer Pro Pack Slim | Billykirk No. 609 Standard Issue Backpack Tote |
|---|---|---|---|
| WestJet | 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.