I purchased this last summer, but my child only played with it a few times indoors and then lost interest, so it's been in storage. There are no noticeable stains, but if you look closely at the inside of the backpack, there's a slight bit of dirt as shown in the photo. I don't think it will affect use at all, but please purchase only if you don't mind. Size: Approximately 190x230x110mm Material: Nylon, Polyester