What size duffel bag is best for carry-on travel?

For most airlines, a duffel in the 30-45L range fits carry-on dimensions, while 50-65L bags are better suited to short checked trips or weekenders. The 100L+ packable models in this list, such as the 120L Urtala, are aimed at hauling gear or checked luggage rather than carry-on use, so confirm dimensions against your airline's limits before flying.