Brompton Bike Travel BagBrompton Bike Travel Bag Brompton Bike Travel Bag is the most lightweight travel bag available. Take your bike literally anywhere while keeping it protected and most importantly easily transportable. The bag works as a backpack and a travel bag, allowing you the versatility to use it as you see fit. Even if you're in the city, wearing this as a backpack is incredibly useful as when you reach a station you can simply fold your bike, put it in your bag