Shipper Seal and Container Seal in Import-Export Business In the import-export business, seals play a crucial role in securing shipments and preventing unauthorized access during transportation. Two primary types of seals used in containerized cargo are shipper seals and container seals. A shipper seal is affixed by the exporter (shipper) after stuffing the goods inside the container. This seal helps ensure that the cargo remains intact from the point of loading until it reaches the port or term