... also named Mailing envelopes courier bags,experess bags,mailing bag.1.Material:LDPE.2.Film Colour: outside-white ... & inside-black.TIANBAI PLASTIC3.Type: side sealed bag.Film can be extruded from same material or different ... reference.Twhen you want to purchase the mailing bag,please provide these informations at below:1,size: ... PP, PO, PS,ABS,PET,PE, CPP, PPU, PVC, PE/PO, PO/PE, CPE and EVA. etc. ...