To produce a sealed bag, flange zippers utilize interlocking pieces that seal and safeguard your contents. The distinct texture between the zippers reassures the consumer that the bag has been securely closed. Our flange and multi-flange zippers offer superior closing strength and protection - enabling these bags to carry a broad range of products, such as food items, clothing, footwear, and whatnot! S.I. Industries offer grades with various width / sizes and special Low-Temperature Sealing grades.