The bag sewing thread is made of spun polyester fiber with good silicone and knotless and has high resistance to abrasion/corrosion/acid, is widely used in the agricultural field, industrial packing for sewing, closing open mouth bags, like sugar bags, pp woven sacks, multi-wallpaper bags, sandbags, mesh bags, and others. The bag closing thread is suitable for high-speed bag packing systems such as NEWLONG, FISCHBEIN, UNION-SPECIAL.YAO-HAN, SIRUBA, JUKI, can effectively increase productivity in the sewing process.