Brompton Borough Waterproof Bag – Small (Navy) The smallest of Brompton’s waterproof Borough bags is built for riders who pack light but need full weather protection. Its flexible design converts from shoulder bag to backpack, making it just as useful off the bike as on it. A roll-top closure and fully welded seams keep your essentials dry through Portland drizzle or downpours abroad. The zipped front pocket gives quick access to small items, while aluminum hardware and a rubberized webbing handle add durability and style. Compatible with all Brompton handlebar types, it clips directly to the front carrier block in seconds—ready for your commute, errands, or a spontaneous day out. Simple, waterproof, and right-sized for what matters most. WeightFrom 2.64 kg (5.82 lb) Main Material70% Polyester, 30% TPU Capacity9 L (2.38 gal) FitmentFront Carrier Block CompatibilityAll non-electric Brompton handlebars DimensionsW 11.8″ × H 11.0″ × D 4.3″ WaterproofYes Water ResistantYes StrapsDetachable shoulder / backpack strap Details RF-welded construction (100% waterproof) Detachable 2-way strap — wear as backpack or shoulder bag Aluminium hardware Front pocket with water-resistant YKK Aquaguard zip Air release valve Webbing carry handle Glove-friendly zip pulls No. of Pockets (External)1
