Even without being in the great outdoors, the Back-Roller City give bikers greater flexibility. The bag can be used on both sides or as single pannier. Highly incandescent 3M Scotchlite material reflectors on the pannierssides give increased safety in traffic. The affordable basics can be upgraded with numerous accessories. This model is provided with edge protectors having slots for fixing the ORTLIEB pannier carrying system.The Ortlieb Back Roller City panniers have a capacity of 40 litres (combined) or 20 litres per bike bag. Key Features:Can be used both side or as a single pannier 3M Scotchlite material reflectors Edge protectors Capacity 40 Litres