It's true that the duffel bag is larger than it looks, which is perfect, I think.
It's durable without being bulky, the pockets are easily accessible, inside and out, and it's both cute and sophisticated, but in a subtle way. (You don't necessarily need a rugged duffle bag for it to be durable! --Although, I wouldn't fill the bag with paint cans either.)
It's really perfect as a carry-on for long-haul flights.