Main purpose:

The types and uses of paper containers currently used in the postal industry are as follows: envelopes, mainly used for loading and mailing letters; The postal express special compliance envelope is mainly used for loading and mailing letters, documents or small items; Small paper boxes are mainly used for loading and mailing lightweight items, including powders, bottled liquids, and small items; Special postal paper tubes are mainly used for loading and mailing items with small weight and long rolls, such as calendars and paintings.