Opel FlexDoor: Meriva’s New Open Door Policy Flexibility is all about using space efficiently and for the new Opel Meriva that includes the rear doors. The new FlexDoors create a wide space for rear entry and exit.  By leveraging the potential of rear-mounted hinges, they open a new dimension in door design for small monocabs. The movement required to open it is forward, therefore more ergometric and easy on the back. Practical for anyone, young and old alike!