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About product and suppliers:
        Alibaba.com offers 5,051 heavy duty backpack products. About 33% of these are backpacks, 4% are other camping & hiking products, and 1% are laptop bags. 

A wide variety of heavy duty backpack options are available to you, such as softback, internal frame, and external frame. You can also choose from canvas, nylon, and polyester. As well as from 50 - 70l, 30 - 40l. And whether heavy duty backpack is free samples, or paid samples. 

There are 5,051 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 South America. 

You can ensure product safety by selecting from certified suppliers, including 873 with ISO9001, 599 with Other, and 276 with BSCI certification.