I bought this to protect my laptop, but I've only used it a few times. There's one stain on the back of the small mouse pouch, as shown in image ③. The material is urethane. Large size: Height 31 cm, Width 39 cm, Depth 21 cm Small size: Height 17 cm, Width 23 cm ☆ The small size opens and closes with Velcro. ☆ The large size has two zippers. It seems like it could be used for something else too.