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About product and suppliers:
        Alibaba.com offers 34,201 30-40l polyester backpack products. About 97% of these are backpacks, 1% are laptop bags, and 1% are school bags. 

A wide variety of 30-40l polyester backpack options are available to you, such as softback, internal frame, and external frame. You can also choose from 600d, microfiber, and nylon. As well as from day backpack, cycling, and camping & hiking. And whether 30-40l polyester backpack is 30 - 40l, or 50 - 70l. 

There are 34,198 30-40l polyester backpack suppliers, mainly located in Asia. The top supplying countries are China (Mainland), Hong Kong, and Germany, which supply 98%, 1%, and 1% of 30-40l polyester backpack respectively. 

0-40l polyester backpack products are most popular in North America, Western Europe, and South America. 

You can ensure product safety by selecting from certified suppliers, including 6,177 with Other, 4,841 with ISO9001, and 2,954 with BSCI certification.