Polymailer Packing Bag Item Specification: Features: Type: Express Bags/ Parcel Package Packing Stuff Great for packing gifts or small items for Festivals, Christmas Material: new PO material + PE material. Process: Three-layer co-extrusion (PO+PE+PO), PO makes the bag firm and smooth, feels good, the staff can load goods, and PE strengthens the toughness to make the bag strong and not easy to break Size: Top Sealing Cover Width: 40mm Bag Body Size(Top Sealing Cover not included) Kinds optional as below: 28cmx42cm 38cmx52cm 20cmx30cm