Heavy load carrier with swivel flap

A heavy load carrier, comprising:

• peripherally arranged side walls, at least one of the side walls having a flap which seals a flap opening in the side wall in the closed position, and that is configured to be swivelled into an opening position in which the flap is folded against the side wall from the outside;
• wherein the flap is articulated to the side wall by coupling elements, the coupling elements being articulated to the side wall by side wall joints and to the flap by flap joints, and wherein in at least one compulsory guide for the flap is configured such that during the swivelling of the flap the at least one compulsory guide simultaneously brings about a translational flap movement in a plane of the flap in such a way that the flap moves upwards in the direction of an upper edge of the side wall during the closing of the flap opening;
• and
• a spring is arranged on the lateral side edges of the side wall which delimits the flap opening, and is biased with the engaging of the flap in a closed position such that the flap is held in the locked position, wherein the spring presses against the flap when the flap is engaged in the closed position.