After I had looked at various pockets of third-party it was time to To give a Change originals. It should be a bag to a housing and should consider possible multiple lenses. The shortlist was the PEN Street Case L and PEN Case Modern Large. The Case Modern Large acts but is something noble significantly smaller. The Street Bag is the clear winner. It looks chic, has not your typical camera bags appearance and it fits a lot into it, more precisely:
An E-P2 with attached standard zoom and VF3-seeker, a Lumix 1.7 / 20, an M.ZUIKO 9-18, an M.ZUIKO 40-150 and three batteries. And the whole smaller than A4. What more do you want?