Thank you for viewing. This is a handmade mini tote bag. It has a lining and an inner pocket. A smartphone can fit in the inner pocket. An interfacing is attached to the outer fabric. An A5 size book can fit in it. How about using it as a sub-bag? Size (bag) Height: Approximately 24cm, Width: Approximately 21cm There may be some slight variations. Please understand that this is a handmade item and purchase accordingly. #handmade #totebagmini #A5