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About product and suppliers:
        Alibaba.com offers 4,647 heavy duty backpack products. About 33% of these are backpacks, 2% are promotional bags, and 2% are school bags. 

A wide variety of heavy duty backpack options are available to you, such as 600d, nylon, and 1680d. You can also choose from softback, external frame, and internal frame. As well as from day backpack, camping & hiking, and cycling. And whether heavy duty backpack is 30 - 40l, or 50 - 70l. 

There are 4,647 heavy duty backpack suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of heavy duty backpack respectively. 

Heavy duty backpack products are most popular in North America, Western Europe, and Eastern Europe. 

You can ensure product safety by selecting from certified suppliers, including 701 with ISO9001, 632 with Other, and 221 with BSCI certification.
        
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