I prepared this for my 11-year-old son when he entered kindergarten, but he didn't like it, so I kept it in a storage case unopened. It's a Sanrio product. The bottom is denim, which is stylish. I think it's a rare design as it's no longer sold. It's convenient with a non-slip stopper. The back is mesh. When purchased, the main unit price was 4500 yen + tax.