The quality and grade of backpacks 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 materials used for backpacks generally use 1680D double-strand fabrics which are 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 simpler drawstring bag type backpacks.
Third, the back structure of the backpack directly determines the purpose and grade of the backpack. Outdoor mountaineering or military backpacks, the back structure is more complicated, with more than six pearl cotton or EVA as breathable cushions, and even an aluminum frame. The back of the general backpack is made of a piece of pearl cotton of about 3mm as a breathable board. The simple drawstring type backpack does not have any padding material except the material of the backpack itself.
In summary, the quality of backpacks is mainly a choice for personal leisure and outing hobbies. Different grades of backpacks are suitable for different occasions, so I won’t go into details here.