... printed by copperplate gravure printing and non-printed.3) Material: LDPE or HDPE coextrusion material, outside-white and inside-grey color, 0. ... 06-0.1mm thickness, good security feature and anti- ... -protected materials, OPP, PP, HDPE, LDPE, CPP, PPU, PVC, PE/PO, PO/PE, CPE and EVA, etc.other relative name: courier bag ...