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About product and suppliers:
        Alibaba.com offers 58,805 4 backpack products. About 19% of these are backpacks, 5% are school bags, and 2% are shopping bags. 

A wide variety of 4 backpack options are available to you, such as softback, backpack, and internal frame. You can also choose from 50 - 70l, 30 - 40l. As well as from free samples, paid samples. 

There are 58,710 4 backpack suppliers, mainly located in Asia. The top supplying countries or regions are China, India, and Pakistan, which supply 99%, 1%, and 1% of 4 backpack respectively. 

 backpack products are most popular in North America, South America, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 6,496 with ISO9001, 5,771 with Other, and 2,745 with BSCI certification.