Stitching Thread (Sewing Yarn, Bag Closing Thread) Sack stitching thread is used for hand sewing and for sack stitching machine. Unsurpassed for strength, evenness and finish. Sewing Yarn for bag closure 200g cone. Thread (Sewing Yarn) for bag closure is 2kg cone. A sewing thread must have good sewability and be capable of properly joining the two materials together. After joining these materials together, the sewing thread must last for the life of the product that it is sewed in. The sewing thread must be durable. Contrary to popular belief, strength alone is not the primary prerequisite for a good sewing thread. We bring an extensive range of Polyproplyene Stitching Thread/Bag Closing Thread that is available in different colour.