Aer Pro Pack 20L vs Day Owl Backpack Pro
The Aer Pro Pack 20L is 20L and 1.09kg2.4lb; the Day Owl Backpack Pro is 21L and 1.09kg2.4lb. They weigh the same. The Day Owl Backpack Pro costs $24 less. The Aer Pro Pack 20L fits the carry-on limit of 36 of 36 major airlines and the Day Owl Backpack Pro fits 36; under the seat, 7 and 7 of 26.
| Spec | Aer Pro Pack 20L | Day Owl Backpack Pro |
|---|---|---|
| Price | $179 | $155Best |
| Volume | 20L | 21L |
| Weight | 1.09kg2.4lb | 1.09kg2.4lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 27% |
| Dimensions | 45×30.5×14cm17.5×12×5.5in | 43.2×30.5×12.7cm17×12×5in |
| Laptop | 16" | 16" |
| Bottle pockets | 2 | 1 |
| Opening | Wide-access main compartment | Main compartment closes with a magnetic clasp |
| 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 | Yes | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 840D CORDURA re/cor recycled nylon exterior (bluesign approved), recycled nylon lining (bluesign approved), YKK zippers, Duraflex hardware | First Mile waxed canvas made from 25 recycled post-consumer plastic bottles, 100% recycled polyester lining and trim, algae based foam, water repellant neoprene, conflict-free metal YKK zippers |
| Last checked | 2026-09 | 2026-10 |
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.