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About product and suppliers:
        Alibaba.com offers 2,065 a3 envelope products. About 42% of these are mailing bags, 15% are paper envelopes, and 2% are packaging bags. 

A wide variety of a3 envelope options are available to you, such as kraft, ordinary paper. You can also choose from business envelope, gift envelope. As well as from free samples, paid samples. 

There are 2,060 a3 envelope suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Kenya, which supply 99%, 1%, and 1% of a3 envelope respectively. 

A3 envelope products are most popular in North America, Eastern Europe, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 1,135 with ISO9001, 965 with ISO14001, and 732 with Other certification.
        
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