I only used this for about two and a half years because I replaced it partway through. I used it carefully with a rain cover. There are a few scratches and stains on the inside, but the exterior is in relatively clean condition. It's lightweight and has high cushioning on the back, making it less tiring. The reflectors also shine brightly, so you can feel safe even in dim light! Cleaned with home cleaning sheets. ● Size: Exterior: 32cm (height) x 25cm (width) x 17.5cm (depth) ● Interior: Front zipper pocket x 1 Open pocket x 1 Main compartment: A4 size compatible ● Triple guard specification to prevent deformation ● Lock: One-touch lock