Courier bag 1.Customized logo printed 2.LDPE COEX courier bag,security & permanent adhesive seal. 3.durable mailing ... printed by copperplate gravure printing and non-printed.3) Material: LDPE or HDPE coextrusion material, outside-white and inside-grey color ... composite materials, non-woven environment-protected materials, OPP, PP, HDPE, LDPE, CPP, PPU, PVC, PE/PO, PO/PE, CPE and EVA ...