Abstract: A device for adjusting the position of the seat-back mounted on a travel luggage pack on the back of a motorcycle is disclosed. The device consists of a slide assembly mounted between the motorcycle and the luggage pack. The slide assembly comprises two parallel slide rails movably mounted on fixed lower tracks which are mounted to the back of the motorcycle. The slide rails are attached to the combined luggage pack and seat-back to allow movement of the seat-back. The device further comprises a latching mechanism to lock the slide assembly into place in selected positions.