Brompton Business Backpack – Expandable Commuter Bag with Carrier Block Bracket (A/C/G/P/T Line)The smart commuter backpack that clicks straight onto your Brompton's front carrier block and turns into a proper office backpack the moment you step off the bike. Designed for riders who go from saddle to desk without breaking stride. Why you'll like it Mounts directly on the Brompton front carrier block bracket included Expandable design unzip the side to add 30% more volume when you need it Fits a 15. 6" laptop, tablet, notebook, camera and daily