The Roadwarez Road Tracker Bluetooth-Enabled Cycling Backpack offers hand-free automatic turn signals. Using voice control, you can have the backpack light up a left or right arrow. Alternatively, this cycling pack can light up according to the GPS directions you’re following. To do this, simply turn on the connected app so your smartphone will communicate with the Bluetooth bike backpack. With a built-in 5,000 mAh battery, this light-up bike backpack gives you up to ten hours of battery life. Depending..