The type of double-layer automatic entry and exit box should be considered as part of the container export business, that is, the goods that need to be exported are loaded into the container, compared to this in the import business. It is the business of the container yard (if it needs to be delivered to the port), or it may be carried out by the production factory of the goods (if it needs to be packed at the place of origin). The packing business needs to be reasonably packed into containers according to the nature and volume of the goods, so that they are suitable for ship transportation.