Dodge 2008 Ram 4500 - Manual (Page 174)

The rear storage compartment can be divided into three
separate compartments by using the divider doors inside
the storage compartment. Plastic Grocery Bag Retainers (Mega Cab
Models)
Retainer hooks which will hold plastic grocery bag
handles are built into the back panel of the cab, behind
the rear seat.
Mega Cab Rear Storage Dividers
Grocery Bag Hooks
172 UNDERSTANDING THE FEATURES OF YOUR VEHICLE