A container for holding component parts of a construction toy. The container preferably is a suitcase or briefcase configuration, with a carrying handle at the top. An access cover, comprising a large portion of the front wall of the container and a portion of the bottom wall, is hinged on the bottom wall. When the access cover is open, both the cover and the container lie flat on a floor or other support surface, forming an extra large access opening and allowing easy access to parts within the container. The access cover, when open, forms a tray or receptacle, and can function somewhat like a dust pan, facilitating cleanup after use by enabling loose parts to be scooped onto the open cover and then discharged into the container by upward pivoting movement of the cover.