This wallet has finally met all my requirements. It fit into an incredible number of credit cards (15 pieces to be exact) and it remains still relatively thin.
However, I would not recommend to put more than 12 credit cards into (6 each in the inner and outer part). Although it has on the back of the fold-out inner part 3 more, transverse compartments that make the stock market then but in my opinion too thick and it could possibly credit break when they are too squeezed.
But 12 credit cards is also already a number, most other exchanges offer only 8 places. With 12 cards and some loose change, passport, vehicle registration, a few bills, etc. I come with the wallet to a thickness of about 3 cm at the thickest point. That's a decent value for the "filling".
Quality is also convincing, therefore I can recommend the purse full.