Recently, a new technique has been developed to enhance the printing on woven polypropylene bags. This has been accomplished with reverse printing using BOPP film. With the advent of BOPP film, (laminated to an already strong woven polypropylene bag), the woven bags now have the same high quality graphics found on multiwall paper bags and polyethylene bags. Customers who use paper bags can use their same packing equipment to fill BOPP – open mouth woven polypropylene bags. And it use for animal feed , pet food and so on .