Aer Pro Sling vs Waterfly Defender Vekta RFID Crossbody Bag 4.5L
The Aer Pro Sling is 4.5L and 0.27kg0.6lb; the Waterfly Defender Vekta RFID Crossbody Bag 4.5L is 4.5L and 0.27kg0.6lb. They weigh the same. The Waterfly Defender Vekta RFID Crossbody Bag 4.5L costs $44.01 less. The Aer Pro Sling fits the carry-on limit of 36 of 36 major airlines and the Waterfly Defender Vekta RFID Crossbody Bag 4.5L fits 36; under the seat, 26 and 24 of 26.
| Spec | Aer Pro Sling | Waterfly Defender Vekta RFID Crossbody Bag 4.5L |
|---|---|---|
| Price | $79 | $34.99Best |
| Volume | 4.5L | 4.5L |
| Weight | 0.27kg0.6lb | 0.27kg0.6lb |
| Carry-on compliance | 100% | 100% |
| Personal-item compliance | 100%Best | 92% |
| Dimensions | 17.5×29×9cm7×11.5×3.5in | 32×21.1×6.6cm12.5×8.5×2.5in |
| Laptop | no laptop sleeve | n/a |
| Bottle pockets | n/a | 1 |
| Opening | n/a | Zippered main compartment |
| Warranty | Lifetime | 10 years |
| Organizer | Yes | No |
| 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 | Removable | No |
| Luggage pass-through | No | No |
| Camera compartment | No | No |
| Material | 840D CORDURA re/cor recycled nylon exterior (bluesign approved), recycled nylon lining (bluesign approved), YKK zippers, Duraflex hardware | Eco-friendly nylon with water-repellent finish, polyester lining |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Aer Pro Sling | Waterfly Defender Vekta RFID Crossbody Bag 4.5L |
|---|---|---|---|
| Cebu Pacific | Personal item | Fits | Too big |
| Vietjet Air | 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.