... delivery bag, mailer bag, post envelope: materialLDP and HDPE coextrusion materialthickness0.05-0.12mmbag size35*45+5cm flapsealpermanent self ... , as per your logo artwork design.3) Material: LDPE or HDPE coextrusion material, outside-white and inside-grey color, 0 ... composite materials, non-woven environment-protected materials, OPP, PP, HDPE, LDPE, CPP, PPU, PVC, PE/PO, PO/PE, CPE and EVA, etc.