Quality judgment for school bag
The grade and quality of the backpack are mainly determined from several aspects.
First, workmanship. Every corner and crimping line are neat and tidy, there is no thread drop or jumper phenomenon, every stitch of embroidery is very elegant, which is the standard of high craftsmanship.
Second, the material used for the backpack is generally 1680D double-stranded fabric, which is relatively medium-to-moderate, while 600D Oxford cloth is a more commonly used material. In addition, canvas, materials such as 190T and 210 are usually used for simple drawstring bag type backpacks.
Third, the back structure of the backpack directly determines the purpose and grade of the backpack. High-end and outdoor mountaineering or military backpacks, the back structure is more complicated, there are at least six pieces of pearl cotton or EVA as breathable cushions, and even aluminum frames. The back of the general backpack is a piece of pearl cotton about 3mm as a breathable board. The simplest drawstring type backpack does not have any padding material except the material of the backpack itself.
In summary, backpacks are mainly the best choice for leisure and outing hobbies. Backpacks of different grades are suitable for different occasions, so I won’t go into details here.
