1. Automation and Efficiency Bag closer machines are essential equipment for sealing bags in various industries. These machines provide a quick and efficient way to seal bags, improving productivity and ensuring product integrity. When looking to purchase a bag closer machine, one of the most important factors to consider is the price. In addition to strength and durability, heavy duty thread is also designed to be thicker than regular sewing thread. This can be an advantage when sewing leather, as the thickness of the thread can help to create stronger, more visible stitches. This can give your finished product a more professional and polished look, making it more appealing and marketable.