Brompton Commuter Backpack 25L – Business & Travel Bag with Front Carrier Frame (A/C/G/P/T Line)Brompton Commuter Backpack 25L Business & Travel Bag with Front Carrier Frame (A C G P T Line) The smart commuter backpack that slides onto your Brompton's front carrier and lifts off as a full size business backpack the moment you park. The frame stays on the bike, you walk away with the bag. Designed for riders who go from saddle to desk without breaking stride. Why you'll like it Smart 2 strap mounting the backpack slides over the included frame