As for the narrowness of the credit card slots I can associate myself with what has been said here only. Some experiments with a credit card then showed a mess on the edges of the map (probably Braunbärkot). I had a stable Porsche Design Warranty Card in credit card format. With this card, I then edgewise widened and cleaned the trays. 5 minutes before the time of disposal as everything was fine. The now clean compartments are still tight but you can now accommodate the credit. It is important that the cards have a certain strength: business cards have problems.
Otherwise, I can only add my voice to what has been presented. Beautiful materials, neat stitching and I get everything under what I have one day in advance accommodated with ease in the Samsonite bag (a very different principle).
ADDENDUM: Through constant effort, I now get even 2 credit cards in a drawer. Even with the cards it's getting better.
So do not give up hope
