Sold as a single pannier. The back roller core is the solid base bag among the back rollers and yet 100% waterproof. With its robust polyester fabric it's not only suitable for extended bike tours but also ideal for daily urban commutes. With the back roller core you're always ready to transport important items dry and securely ndash whether it's on your way to work shopping or other urban adventures. A reliable companion that withstands the elements and simplifies your everyday life. If the basic functions of the back roller core are ever insufficient this practical bag can be expanded with various optional accessories. The carrying system bike pannier helps carry the back roller core on your back various inserts provide stability to the bag body off the bike or offer better organization inside the rear bike bag. Further practical details high visibility reflectors on the outside of the bag. Color black material pd620 ps490 bag type single adapter quick lock2.1 instructions download datasheet download 360deg view 360deg view weight 820 g 28.9 oz height 42 cm 16.5 inch upper width 32 cm 12.6 inch lower width 23 cm 9 inch depth 17 cm 6.7 inch volume 20 l 1220.5 cu.inch load 9 kg 19.8 lbs