Abstract: The end walls of the container are hinged to the opposite vertical edges of one side wall. The roof is hinged to a longitudinal listel rigid with said one side wall, inwardly protruding from the longitudinal upper edge of the latter at 90.degree., and is disengageably coupled with a similar listel on the longitudinal upper edge of the other side wall. Both side walls have their longitudinal lower edges hinged to the base wall of the container, the said one side wall being hinged at a level lower than that of the hinges of the other side wall. The container is collapsable to a reduced volume by first folding the end walls onto the inner face of said one side wall, subsequently downwardly folding the roof onto the folded end walls, then downwardly folding onto the base wall said one side wall with its carried end walls and roof, and downwardly folding the other side wall onto the said one side wall.