This is a light blue backpack with blue sides and bottom. I bought it for a field trip and have only used it a few times. There is some dirt on the bottom near the front logo, but otherwise, there are no noticeable scratches or stains. The thickness (excluding the small pocket) is 13 cm, and the length is 43 cm. Please understand that there may be some slight variations due to amateur measurements. Please purchase this item if you understand that it is a used item.