Approximately 31cm x 23cm x 8.5cm. A4 files will barely fit... This is a fashion bag styled like a school bag. It has a shoulder strap, so it can be used in 3 ways: as a handbag, shoulder bag, or backpack. It has been used once for a cosplay photoshoot. Please note that there are creases like the ones on the right side of the first photo. Please understand that this is a used item before purchasing.