The luggage is rectangular in shape, generally between 40 and 80 cm long.
The difference between a trunk and a suitcase is not the size, but the number of handles.
A trunk can be carried with at least 2 hands, therefore 2 handles, the suitcase can be carried with one hand, therefore 1 handle.
The suitcase is accepted by most companies as hand luggage to be put in the cabins of trains, boats, carts, or cars. They can also easily be stacked on trolleys or in box cars.