Abstract: A mountable worksurface comprises a worksurface rotatably attached to a support which is removably mounted to an object. When mounted, and in the open position, the worksurface projects from the cover and provides a rigid surface upon which to work. In a preferred embodiment, the mountable worksurface is in the form of a case for a portable computer having a compartment dimensioned to receive the computer and a cover hingedly connected to the rear of the compartment. The exterior surface of the cover carries a sleeve and a pocket, permitting the cover to be removably mounted on an object by placing the object between the interior of the sleeve and pocket and the exterior of the cover. Adjustment straps extend between the interior surface of the cover and the bottom wall of the compartment and are adjustable to control the distance between the cover and the compartment. Supports positioned in the cover and the bottom wall of the compartment impart rigidity to the case and protect the computer during transport.