What is the purpose of the bulk mail of Chengdu Delivery Division's Commercial Letter Bureau?

Used for enterprises, institutions and groups to mail large items or multiple items. Institutions, enterprises, organizations and other units and individuals can send more than 10 pieces of mail at a time as batch mail. Postage can be charged for bulk mail at one time, and the procedure is simple, and a stamp is not needed. This is the purpose of Chengdu Commercial Letter Bureau to deliver bulk mail.