Abstract: A vehicle-mounted, covered container apparatus includes a container member, a telescopic collapsible cover assembly, and container-to-cover attachment means connected between the container member and the telescopic collapsible cover assembly. The container member can be a sander container. In this respect, the vehicle-mounted, covered container apparatus prevents snow and rain from getting inside the sander container and freezing the sand. Preferably, the telescopic collapsible cover assembly is dome-shaped. The telescopic collapsible cover assembly includes a plurality of rigid curved cover units that are dome segments and that are telescopic with respect to each other. In addition, the plurality of curved cover units are in the form of dome segments. Preferably, the container-to-cover attachment means include a pair of hinge pins connecting the first curved unit, the second curved unit, and the third curved unit together to each other and to the container member.