I got this card protector as a gift from my bank and I am very happy with it. However, I was not able to carry any bank notes with me and I am not comfortable putting the notes loose in my pocket together with my keys. What I needed was a money clip but I could not find any clip which I could fit on the protector. So I created one myself.
The dimensions of the card protector itself are 62mm × 8,5mm as shown in the drawing.