opening in back seat on 1998 Pontiac Bonneville

what is the door that opens into the trunk located in the middle of the back seat for ?

Asked by for the 1998 Pontiac Bonneville
The door in the back seat into trunk is to allow you the flexibility to load long objects into the passenger area instead of having them stick out the back of the trunk. This may allow the trunk lid can close completely in some cases where it may not have.