System for joining containers for a first container (1) with doors at the front and rear thereof and a second container (2) with at least one door at the rear thereof, attached by the smaller sides, which comprises four hooks (3) on the four corners of the containers (1, 2), a plurality of sheets (4, 5) on the interior edge at the rear of the containers (1, 2) fixable to both and which cover the entire interior perimeter of the containers (1, 2), and means for adjusting the identification number of the containers (1, 2).

The means for adjusting the identification number can comprise a series of electronic screens (101, 102) on each container (1, 2) with two control units (102, 202), power sources, and communication means between the control units (102, 202) and optionally a contact (103, 203) in the support area of a sheet (4, 5).

System for joining containers for a first container (1) with doors at the front and rear thereof and a second container (2) with at least one door at the rear thereof, attached by the smaller sides, which comprises four hooks (3) on the four corners of the containers (1, 2), a plurality of sheets (4, 5) on the interior edge at the rear of the containers (1, 2) fixable to both and which cover the entire interior perimeter of the containers (1, 2), and means for adjusting the identification number of the containers (1, 2). The means for adjusting the identification number can comprise a series of electronic screens (101, 102) on each container (1, 2) with two control units (102, 202), power sources, and communication means between the control units (102, 202) and optionally a contact (103, 203) in the support area of a sheet (4, 5).