Experience with the use of ALGOL as SIL

A luggage carrier is disclosed herein mountable on the rear rack of a motorcycle which includes a base frame for supporting an article of luggage and an articulated frame which is selectively movable between a first position and a second position. A backrest is resiliently carried on the articulated frame so that the backrest may either support the back of a passenger when the frame is in its first position or support the driver's back when the frame is in its second position. The articulated frame includes an over-the-center toggle mechanism for resiliently and yieldably maintaining the frame and the backrest in its selected position. Releasable fasteners hold the articulated frame in its first position and a releasable locking mechanism holds the backrest in its respective operative positions.