Aer Flight Pack 3 vs Boundary Supply Rennen Pro X-Pac
The Aer Flight Pack 3 is 20L and 1.5kg3.3lb; the Boundary Supply Rennen Pro X-Pac is 20L and 1.45kg3.2lb. The Boundary Supply Rennen Pro X-Pac is 0.05kg0.1lb lighter. The Aer Flight Pack 3 costs $220 less. The Aer Flight Pack 3 fits the carry-on limit of 36 of 36 major airlines and the Boundary Supply Rennen Pro X-Pac fits 36; under the seat, 1 and 0 of 26.
| Spec | Aer Flight Pack 3 | Boundary Supply Rennen Pro X-Pac |
|---|---|---|
| Price | $179Best | $399 |
| Volume | 20L | 20L |
| Weight | 1.5kg3.3lb | 1.45kg3.2lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 4%Best | 0% |
| Dimensions | 46×30×14cm18×12×5.5in | 48×29×17.5cm19×11.5×7in |
| Laptop | 16" | 17"Best |
| Compartments | 3 | n/a |
| Bottle pockets | 1 | 2 |
| Compression straps | 0 | n/a |
| Warranty | Lifetime | Lifetime |
| Organizer | Yes | Yes |
| Shoe compartment | No | No |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | Yes |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | Yes | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 1680D Cordura ballistic nylon exterior (bluesign approved), soft woven lining, YKK zippers | X-Pac VX21 Ocean Edition outer, recycled 230D nylon ripstop liner |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Aer Flight Pack 3 | Boundary Supply Rennen Pro X-Pac |
|---|---|---|---|
| Frontier Airlines | Personal item | Fits | Too big |
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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.