Aer Gym Duffel 3 vs KNKG CORE PRO Duffel Small 25L
The Aer Gym Duffel 3 is 24.1L and 1.32kg2.9lb; the KNKG CORE PRO Duffel Small 25L is 25L and 1.4kg3.1lb. The Aer Gym Duffel 3 is 0.08kg0.2lb lighter. The Aer Gym Duffel 3 costs $11 less. The Aer Gym Duffel 3 fits the carry-on limit of 31 of 36 major airlines and the KNKG CORE PRO Duffel Small 25L fits 15; under the seat, 0 and 0 of 26.
| Spec | Aer Gym Duffel 3 | KNKG CORE PRO Duffel Small 25L |
|---|---|---|
| Price | $169Best | $180 |
| Volume | 24.1L | 25L |
| Weight | 1.32kg2.9lbBest | 1.4kg3.1lb |
| Carry-on compliance | 86%Best | 42% |
| Personal-item compliance | 0% | 0% |
| Dimensions | 29×43×23cm11.5×17×9in | 25×40×25cm10×15.5×10in |
| Laptop | 16"Best | 14" |
| Bottle pockets | 2 | 1 |
| Opening | Zippered main compartment | Zippered main compartment |
| Warranty | Lifetime | 25 years |
| Organizer | Yes | No |
| Shoe compartment | Yes | Yes |
| Hydration sleeve | No | No |
| Frame sheet | No | No |
| Water-resistant | No | No |
| Rain cover | No | No |
| MOLLE | No | No |
| Hip belt | No | No |
| Sternum strap | No | No |
| Load lifters | No | No |
| Shoulder strap | Yes | Yes |
| Luggage pass-through | Yes | No |
| Camera compartment | No | No |
| Bike-ready | No | No |
| Material | 1680D CORDURA ballistic nylon exterior, antimicrobial-treated liner, YKK zippers, Duraflex hardware | 500D nylon body (PVC backing), ripstop nylon internal lining, YKK zippers, powder-coated steel hardware |
| Last checked | 2026-09 | 2026-10 |
Where their airline fit differs
| Airline | Limit | Aer Gym Duffel 3 | KNKG CORE PRO Duffel Small 25L |
|---|---|---|---|
| Air Canada | Carry-on | Fits | Too big |
| AirAsia | Carry-on | Fits | Too big |
| Alaska Airlines | Carry-on | Fits | Too big |
| American Airlines | Carry-on | Fits | Too big |
| Cebu Pacific | Carry-on | Fits | Too big |
| Delta Air Lines | Carry-on | Fits | Too big |
| JetBlue Airways | Carry-on | Fits | Too big |
| Lufthansa | Carry-on | Fits | Too big |
| Norwegian Air Shuttle | Carry-on | Fits | Too big |
| Qantas | Carry-on | Fits | Too big |
| SAS | Carry-on | Fits | Too big |
| Turkish Airlines | Carry-on | Fits | Too big |
| United Airlines | Carry-on | Fits | Too big |
| Vietjet Air | Carry-on | Fits | Too big |
| WestJet | Carry-on | Fits | Too big |
| Wizz Air | Carry-on | 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.