Ok, after having my micro wallet design with coin storage and clip for paper money, it turned out that I need even less for everday's commute , what is really needed for my commuter life (with bicycle), is to have the key for the lock of my bicycle, my door key as also company access card, an ID and the ATM card .
Nothing more needed. (as money is accessed via ATM and nearly everything can be paid by phone or ATM card).
So, I have reduced my "swiss army wallet" to the minimum.
Here it is the "micro mini wallet" - smaller, lighter and great for every day commute, without forgetting most important things: Keys,money(ATM) and ID.
Since 2 months in use without any complaints.
Summarizing: you have space for 3 cards and keys.