A trunk or top-box is a storage compartment fitted behind the seat, often complimenting panniers or saddlebags. Original equipment versions may be removable or an integral part of the bike e.g. as fitted to the Honda Goldwing or BMW K1200LT, and may be fitted with the motorcycle rear lights, and a backrest for a passenger. The top box may also be an after-market fitment.Trunk may also refer to the under-seat storage space built into a motorcycle or scooter.