Made of PU material but with delicate leather texture, it is soft and not stiff. No matter how long the back is, it will not feel cheap. The lining is made of fabric, which is skin friendly and does not scratch objects. It can also cushion and protect the computer The main compartment can easily accommodate laptops and daily essentials, with a built-in zippered compartment that fits perfectly for documents and headphones, eliminating the need to search through large bags; The size is sufficient for commuting capacity without being bulky or cumbersome. The shoulder strap is designed with a wide width and a leather cushioning layer, which does not compress the shoulders even after being worn for a long time; Side buckle+adjustable shoulder strap, allowing for free switching between handheld, dual shoulder, and single shoulder modes.syi