A case for a mobile communications device includes a main body and a cover. The main body defines a cavity to receive the device. The cover includes a cover portion selectively covering the cavity and a connection portion to connect the cover portion to the main body. The cover portion is formed, at least partially, of a flexible sheet. A free edge of the cover portion adjacent to the side wall opposite the connection portion is provided with a tab which is an extension of the flexible sheet material forming a cover portion. A stud fastener is fixed to the tab. Either the top, bottom or one of the side walls of the main body has an opening. When the cover portion is in its closed position, the tab moves so that the stud enters the opening and is resiliently deformed to hold the stud in the opening.