Brompton Front carrier block for backpack frameBrompton Front carrier block for backpack frame Brompton Front carrier block for backpack frame allows you to easily attach Brompton or other bags to the front of your bike, which means that you don't need to carry weight on your back or shoulder. An essential if you are using Brompton luggage; carrying bags on the front of the Brompton is easy and minimizes any effect on bike handling. Fits all Brompton bikes and comes with full instructions.