Often the more exquisite the backpack, the more complex its workmanship, the more the process, the more manual work, resulting in labor costs will also increase. High prices bring high quality. Sometimes, a small number of customized backpack materials and requirements are more special, such as color or tattoo requirements with their own, rare hardware, increase the difficulty of material search. When lucky, less than half a day to complete the purchase, bad luck when the whole day can not be found.
Of course, this also has to do with the procurement of personal business familiarity, but it should be explained that the process of looking for board materials is necessary to spend a lot of energy, time and labor.