Postal sector has an exceptional international nature of operation and with the establishment of the Universal Postal Union (UPU), international coordination foundations of package shipment among all countries were established. In the paper some of the key particularities of international postal traffic are shown. Principles which the international postal traffic is based on are listed and explained. Quality measurements of international package shipment are conducted continuously. Procedures of work with international postal packages are plainly presented. Also the data concerning international package shipments are shown and analyzed by years, months and sorting areas. By analyzing the data, charges in the amount of shipments can be seen and based on that, certain capacities for package processing and flow distribution can be forseen.