The invention relates to the field of wearable and portable computers. The document cover includes a lower layer portion having a wall surrounding front, rear, left and right of the conveyer and an upper layer portion covering over the conveyer. The door is folded on the live hinge so that the door covers the spray head, and then substantially permanently on the nozzle body with the door covering the spray head. This increases the expansion functional density for portable computer hosts, such as PDAs.