Amazon.com : Vincita Bag Adapter for Brompton Bike Hardware Kit - Compatible with Brompton Front Carrier Block - Bolts and Nuts Included - Bicycle Accessories - Convert Any Bag to fit Your
Five Accessories Every Brompton Rider Needs – Condor Cycles
Vincita Birch Front Bag 2.0 for Brompton Folding Bicycle - with Removable Front Carrier Frame for Brompton Folding Bicycle, Rain Cover and Should Straps - Brompton Bike Accessories for Rider (Brown)