245 mm by 225 mm. Miku medium-sized pain bag is 245 mm long by 225 mm wide. Pain bag refers to a bag full of cartoon characters' badges and dolls, such as badges and dolls. Such a bag will make people feel "surprised" and "strange and weird". The word "pain" in Japanese has this meaning, so such a package is called a pain package, which is a way for fans to express their love for the secondary character.