Cargo being loaded in a unit load devices (ULD) placed beneath the passenger seating area. The aircraft have a hold in front (Forward hold or hold 1 & 2) and another hold in the back side of the aircraft (AFT hold or hold 3 & 4), being separated with a plastic divider from the bulk hold (hold 5). Please see the shape 1.1.1.b.
In the area between FWD Hold and AFT hold are fuel tanks of the aircraft.
Wall of the holds are being marked with the numbers showing the location of each unit load device for example
11R is compartment 1 in forward hold, 1st position, right side of the aircraft or
32L shows the AFT hold position in compartment 3, second row, left side.
Left and Right side is determined by looking to the nose of the aircraft.