The invention relates to a heavy load carrier comprising peripherally arranged side walls which in an upright position define an interior of the heavy load carrier with a base, at least one of the side walls having a flap which seals a flap in the side wall in a closed position, the flap comprising first locking elements which can be brought into at least two states together with or separately from the flap, in the closed position, in a locked state the first locking elements cooperating with second locking elements of the side wall, such that the flap cannot be opened by pressure on the flap from the interior of the heavy load carrier perpendicular to a flap plane, and in an unlocked state the flap being able to be opened by pressure on the flap from the interior of the heavy load carrier perpendicular to the flap plane.

An assembly box for transportation is disclosed. The assembly box for transportation may comprise: a vertical corner frame arranged at a corner portion; first and second horizontal frames arranged perpendicularly, with the vertical corner frame interposed therebetween, so as to constitute upper and lower edge portions of a side wall; and corner brackets connecting the upper and lower ends of the vertical corner frames with ends of the first and second horizontal frames, respectively.

A modular crate assembly for the handling and transportation of goods, including a bottom pallet part and a sidewall having four side panels mounted onto the bottom pallet part. The four side panels are modular and formed of multiple side panel modules that are assembled and mutually joined at corners to form the sidewall, with each side panel module including first and second lateral mating interfaces configured to allow direct joining of two adjacent side panel modules along two perpendicular planes to form the corners of the sidewall. The first and second lateral mating interfaces are configured to allow direct (or indirect) joining of two adjacent side panel modules along a same plane to form each side panel. The first lateral mating interface is provided with a male or female connecting structure configured to mate with a corresponding female or male connecting structure provided on the second lateral mating interface.