This is a generously sized pouch with a 5cm gusset, made using a 20cm ball-chain zipper. It also includes a regular pocket and a card pocket, so I hope you can use it as a bankbook pouch or a medical record pouch (#^.^#) ◯ 20cm ball-chain zipper ◯ Sturdy construction with thick interfacing on all parts, including the outer fabric, lining, and the contrasting sections ◯ Inner regular pocket and card pocket ◯ Patterned fabric: Cotton-blend Oxford * Slight fabric imperfections may remain ◯ Plain fabric: Oxford Width: Approximately 20cm Height: Approximately 13.5cm Gusset: Approximately 5cm * Although I strive for careful sewing, this is a handmade item, so the stitching may not be perfect. I appreciate your understanding and forgiveness m(__)m * I have a dog. There may be some overlooked dog hair, so please refrain from purchasing if you have allergies m(__)m