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About product and suppliers:
        Alibaba.com offers 1,873 a3 envelope products. About 39% of these are mailing bags, 18% are file folder, and 16% are paper envelopes. 

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

There are 1,873 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 Western Europe. 

You can ensure product safety by selecting from certified suppliers, including 958 with ISO9001, 819 with ISO14001, and 701 with Other certification.