SEIL bag is a bicycles riders' backpack and also shows left and right turn signal of the bicycle rider. Watch the video! "When a rider using hand-signal, the rider is riding bicycle with one hand. It can lead an accident. But this product provides safer and simpler control for bicycle riders. Seil Bag is designed to show left and right turn signal of a bicycle rider. Simply, controlling the detachable wireless controller enables various signals such as directional signals, emergency signal. "