Simple suitcase for Siku baggage cart and airplanes

The simplest model I could think of that would suit Siku's baggage cart, useful for using it as cargo for the plane or other toys, feel free to modify it at https://www.tinkercad.com/things/fGyFTNPZ1XG-simple-suitcase-for-siku-baggage-cart-and-airplanes