Abstract: An attache case type accessory is provided for motor vehicles or the like having at least two seats arranged one behind the other, the front seat 2 having a head-rest 10 or the like. The accessory is adapted to be removably mounted to the back of the front seat 2 so as to form a functional platform for a passenger sitting on the back seat. The attache case accessory includes a casing 20, a rigid frame 22 and a stabilizing means 24. The attache case type accessory is rotatably mounted about a shaft 30 so that it can be, in a non-use position, in a substantially vertical plane, and; in use position, in a substantially horizontal plane. The upper portion of the rigid frame 22 is suspended by a suspending and height adjustment means to the vertical supports of the head-rest 10 of the front seat 2. The stabilizing means comprises a pair of arms 24 that engage the back 4 of the seat so as to adjust and maintain the accessory in its substantially horizontal and vertical planes respectively.