Sissy bar

A sissy bar, also called a "sister bar" or "passenger backrest" is an addition to the rear of a motorcycle that allows the rider or passenger to recline against it while riding. Alternately it can serve as an anchor point or support for cycling supplies that are not part of the bike, including spare helmets, backpacks, or sleeping bags and other camping gear or items a rider feels is needed, such as tool-kits, map books, GPS or cameras.