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What is a backpack made of?

Backpack is an essential material in our daily life. Backpacks include various names including knapsack, rucksack, rucksac, pack, sackpack, booksack. Several sites are presenting backpacks of several brands in front of you for example LeatherSight. To make a backpack, several materials are used including leather, cotton canvas, cordura nylon, nylon, ripstop nylon, pack cloth nylon,…