Can any one please tell me what size are kids book bag? I have my youngest GD and my Great Niece are both starting school next year and need book bags . I am going to make quilted bags with their names on them. What I do not know is---how big to make them. I did get a lot of fat quarters today from LQS for ( I don't believe it here in Australia) $2 each. I got different ones in pink and lavender purple with contrasting colors for each girl. I am giving them a zhuzhu pet in the bags. But having said all that I still don't know big to make the bags.