First, workmanship. Every corner and thread pressing are neat, there is no off-line and jumper phenomenon, and every stitch of embroidery is exquisite, which is the standard of high technology.
Second, the material used for backpack is generally 1680D double strand fabric, which is relatively medium, while 600D Oxford fabric is commonly used. In addition, materials such as canvas, 190T and 210 are usually used for backpacks of simple bundle pocket type.
Third, the back structure of the backpack directly determines the use and grade of the backpack. For outdoor mountaineering or military backpacks, the structure of the back is relatively complex. There should be more than six pieces of pearl cotton or EVA as breathable mats, and even an aluminum frame. The back of a common backpack is made of a piece of 3 mm pearl cotton as a breathable board. The simple bundle pocket type backpack has no cushion material except the material of the backpack itself.
To sum up, the backpack quality is mainly the choice of personal leisure and going out. Different grades of backpacks are suitable for different occasions, which will not be described here.
