Metro Backpack M, Black, with frame.
 
The first backpack designed to work with the Brompton front luggage system, leaving you with free hands for your bike and anything else during your commute. 
 
Made from a recycled polyester yarn, with a padded air mesh rear panel. This bag features two expandable side pockets and a smart magnetic snap system to keep straps safely in place whilst riding. 
 
An ideal bag for journeys that include a number of off bike sections or for those that prefer to spread the load across two shoulders.