... serve as exterior bag and printed with code, mailing bag.courier bag OEM ISO9001,outside-white&inside-black express bag.able ... serve as exterior bag and printed with code, mailing bag.courier bagCourier bag, express delivery bag, mailing bag: Strict quality control ... .3.Type: side sealed bag.Film can be extruded from same material or different.4.permanent adhesive tape on lip(4 ...