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Kolysen paper bag with window Kolysen Packaging Integration Co.,LTD. has offered many representative products to global customers, such as paper bag with window. We have introduced quality management systems and the latest technology, ensuring all our products are manufactured with an extraordinary level of precision and quality. We also have an extensive investment in product and technology R&D to improve the performance and durability of our products, making our products more cost-effective to customers.characteristics of packaging,foil wrap paper,microwave popcorn bags.