Boundary Supply Errant Pro X-Pac vs Boundary Supply Prima System
The Boundary Supply Errant Pro X-Pac is 31L and 1.94kg4.3lb; the Boundary Supply Prima System is 30L and 1.9kg4.2lb. The Boundary Supply Prima System is 0.04kg0.1lb lighter. The Boundary Supply Prima System costs $220 less. The Boundary Supply Errant Pro X-Pac fits the carry-on limit of 35 of 36 major airlines and the Boundary Supply Prima System fits 35; under the seat, 0 and 0 of 26.
| Spec | Boundary Supply Errant Pro X-Pac | Boundary Supply Prima System |
|---|---|---|
| Price | $499 | $279Best |
| Volume | 31L | 30L |
| Expands to | n/a | 38L |
| Weight | 1.94kg4.3lb | 1.9kg4.2lbBest |
| Carry-on compliance | 97% | 97% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 52×33×20cm20.5×13×8in | 53×30×18cm21×12×7in |
| Laptop | 17"Best | 16" |
| Bottle pockets | 1 | 1 |
| Compression straps | n/a | 0 |
| Opening | Clamshell, clamshell + side zip | Clamshell |
| Warranty | Lifetime | Lifetime |
| 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 | Removable | No |
| Sternum strap | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | Insert sold separately | Insert sold separately |
| Material | U.S.-made VX21 X-Pac | n/a |
| Last checked | 2026-09 | 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.