... anti-static,customise logo express ba Poly courier bag, express bag, and mailing bag, express delivery bag, mailer bag, post envelope: materialLDP and HDPE coextrusion ... certification.2) Printing: 1-10 colors, both printed by copperplate printing and non-printed plain, as per your logo artwork design. ... -protected materials, OPP, PP, HDPE, LDPE, CPP, PPU, PVC, PE/PO, PO/PE, CPE and EVA, etc.