A transport unit, such as a container, comprising a rectangular first main part (1, 1', 1 ") whose corners (2 to 4, 2', 3', 5', 2", 3", 5") define a planar main plane (31, 31', 31") that joins to a longitudinal first side (6, 6', 6") of the first main part (1, 1', 1") and a second longitudinal side (7, 7', 7") of the first main part facing the first side and a first end (8, 8', 8") which is at a right-angle to the longitudinal direction of the first main part (1, 1', 1") and to said sides (6, 7, 6', 7', 6", 7") of the first main part and a second end (9, 9' 9") facing the first end; and a rectangular second main part (10, 10', 10") to be placed against the first main part (1, 1', 1") in order to provide a closed transport unit, the second main part (10, 10', 10") having corners (11 to 14, 11', 12', 11", 12", 13", 14") that define a planar main plane (15, 15', 15") that joins to a longitudinal first side (16, 16', 16") of the second main part (10, 10', 10") and a longitudinal second side (17, 17', 17") of the second main part facing the first side and a first end (18, 18', 18") that is at a right-angle to the longitudinal direction of the second main part (10, 10', 10") and to said sides (16, 17, 16', 17', 16" 17") of the second main part and a second end (19, 19") facing the first end of the second main part, the transport unit comprising guiding devices (22, 23, 28, 22', 23', 28', 22", 23", 28") for guiding the second main part (10, 10', 10") to set onto the first main part (1, 1', 1"), each guiding device comprising a guiding part (24, 25, 29, 24', 25', 29', 24", 25", 29"), characterized in that the second side (7, 7', 7") of the first main part (1, 1', 1") comprises at least two guiding devices (22, 23, 22', 23', 22", 23"), each one of which comprises a guiding part (24, 25, 24', 25', 24", 25") the distance of whose free end (26, 27, 26', 27', 26", 27") from the main plane (31, 31', 31 ") of the first main part (1, 1', 1 ") is greater than the maximum height of the first side (6, 6', 6") of the first main part (1, 1', 1") and greater than the maximum height of the second end (9, 9', 9") of the first main part (1,1',1") and that the first end (8, 8', 8") of the first main part (1, 1', 1") comprises a guiding device (28, 28', 28"), which comprises a guiding part (29, 29' 29") the distance of the free end (30, 30', 30") of which from the main plane (31, 31', 31") of the first main part (1, 1', 1") is greater than the maximum height of the first side (6, 6', 6") of the first main part (1, 1', 1") and greater than the maximum height of the second end (9, 9', 9") of the first main part (1,1',1"), wherein the guiding parts (24, 25, 29, 24', 25', 29', 24", 25", 29") are arranged to together provide a horizontal three-point support for the second main part (10, 10', 10") when the second main part is separate from the first main part (1, 1', 1 ") and above the first main part, the second main part being supported by said three-point support above the first main part at a specific centred position in relation to the first main part so that the second main part (10, 10', 10") is prevented from moving in the horizontal direction towards the guiding parts (24, 25, 29, 24', 25', 29', 24", 25", 29") but is allowed to move in horizontal direction away from the guiding parts so that the second main part (10, 10', 10") moves away from the specific centred position and away from the three-point support, the guiding parts (24, 25, 29, 24', 25', 29' 24", 25", 29") being arranged to guide the second main part (10, 10', 10") from the specific centred position where the second main part is separate from the first main part and above the first main part to set onto the first main part (1, 1', 1") when the second main part (10, 10', 10") is lowered onto the first main part (1, 1', 1 ") in order to provide a closed transport unit.