... -extrusion Self-adhesive Customized design custom multilayer co-extrusion plastic mail bag Made of PE,multilayer co-extrusionhot-melt adhesive ... This kind of bag is used for courier, express, and mail services. Printing Offset printing, Flexo printing, Silk-screen printing ... fashion design,practical application Artwork format PDF/AI/Cdr StylePoly mail bagThickness35-120 micron ( 1.38-4.72mil) packing ...