Many people have to take many things when they participate in some activities, so holding a backpack is a good choice for them. Because many things can be put into one package, so nice ,so easy thing. When climbing the hills or attending to school, the backpack is a must for their convenience. Travels prefer their dual-use, because backpacks can be backed with single or both shoulder belts. For the material of bags, it can be sorted into nylon, canvas, PU leather and so on. Wholesale backpacks would be suitable for the people who are interested in.