Approximately 12x18 cm. This is a multi-purpose pouch. Use it for your bankbook, medical record book, lottery tickets, mother and child health handbook, etc. Put anything you like in it! It doesn't take up much space, so it won't be bulky in your bag. I'll offer a small discount for bulk purchases. This is a handmade item by an amateur. Please understand this before purchasing. I have other handmade items for sale as well. Please take a look if you'd like (^.^) It will be sent via standard mail. #pouch #bankbookholder #medicalrecordbook #motherandchildhealthhandbookcase #flatpouch #circle #minaperhonen