Aer Day Pack 3 vs Monos Metro Backpack
The Aer Day Pack 3 is 14L and 1.27kg2.8lb; the Monos Metro Backpack is 14L and 1.2kg2.6lb. The Monos Metro Backpack is 0.07kg0.2lb lighter. The Aer Day Pack 3 costs $56 less. The Aer Day Pack 3 fits the carry-on limit of 36 of 36 major airlines and the Monos Metro Backpack fits 36; under the seat, 7 and 9 of 26.
| Spec | Aer Day Pack 3 | Monos Metro Backpack |
|---|---|---|
| Price | $159Best | $215 |
| Volume | 14L | 14L |
| Weight | 1.27kg2.8lb | 1.2kg2.6lbBest |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 27% | 35%Best |
| Dimensions | 44×30×14cm17.5×12×5.5in | 42×28×15cm16.5×11×6in |
| Laptop | 16"Best | 15" |
| Bottle pockets | 1 | n/a |
| Warranty | Lifetime | n/a |
| 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 | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | No | No |
| Luggage pass-through | Yes | Yes |
| Camera compartment | No | No |
| Material | 1680D CORDURA ballistic nylon exterior (bluesign approved), 840D nylon face with weather-resistant coating, recycled nylon lining (bluesign approved), YKK zippers, Duraflex hardware | Nylon twill with ultra-microfibre vegan leather accents |
| Last checked | 2026-09 | 2026-09 |
Where their airline fit differs
| Airline | Limit | Aer Day Pack 3 | Monos Metro Backpack |
|---|---|---|---|
| Air Canada | Personal item | Too big | Fits |
| JetBlue Airways | 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.