... ,mailing usage 4,mail,courier bags 5,Courier use Introductions:Mailing bags, also named Mailing envelopes courier bags,experess bags,mailing bag.1.Material ... outer surface allows for excellent high resolution color printing and hand-writing.The adhesive tap was easy opening, reduces labor costs ... , PPU, PVC, PE/PO, PO/PE, CPE and EVA. etc. Types of the bags:1,inner gray,outer white,with a PE ...