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resealable zipper: you can either manual seal zipper part, or heat seal the open section above the zipper, so that achieve storage effect, and these food storage bags can be applied many times covering an area of 1700 square meters factory, and equips with advanced production machines we have around 1000 designs in stock, also we can customize bags for you, should you have any enquiry looking forward to establishing a long-term business relationship with you all of our production engineers have more than 10 years industry experience..syi