... permanent adhesive bag. 3.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 materialthickness0.05-0.12mmbag size35*45+5cm flapsealpermanent self ... such composite materials, non-woven environment-protected materials, OPP, PP, HDPE, LDPE, CPP, PPU, PVC, PE/PO, PO/PE, ...