A storage container comprising a four-sided structure having a bottom panel and a pivotally mounted top panel. The container is provided with a lateral beam extending side-to-side across a back panel thereof. Hinge means are fixed to the back panel and extend along three surfaces of the lateral beam, and are fixed to the top panel, such that the top panel is pivotally mounted on the back panel and adapted to open and close with substantially simultaneous engagement on the four sides of the top panel with the four sides of the container.