I bought a randoseru (Japanese school bag) as well, but it was too heavy for my daughter, so I switched to this type of backpack. The back is mesh, which is comfortable even in the summer, and above all, it holds a lot, making it more practical than a randoseru. I am selling it now because she is using a different backpack. The bottom inside has some pencil marks, but the exterior is relatively clean because I used a randoseru cover. If you are concerned about the stains, please clean it yourself. Please take a close look at the photos and only purchase if you understand the condition.