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About product and suppliers:
        Alibaba.com offers 2,231 flat mailer products. About 34% of these are mailing bags, 7% are packaging bags. 

A wide variety of flat mailer options are available to you, such as poly, kraft paper, and kraft. You can also choose from free samples, paid samples. 

There are 2,231 flat mailer suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of flat mailer respectively. 

Flat mailer products are most popular in North America, Domestic Market, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 1,671 with ISO9001, 1,142 with ISO14001, and 308 with Other certification.