The accessories pass the folding test! Decathon's handlebar water bottle holder and strap-on mount for water bottle cage. Sub 10€ solution for phone holder & water bottle. : r/Brompton
Titanium Water Bottle Holder for Brompton
Klean Kanteen Classic 27oz Bottle | Brompton Bicycle UK
Water Resistant Stem Bag for BROMPTON and Birdy in GREEN OLIVE | eBay
Waterproof Stem / Saddle Water Bottle Bag for Brompton
F+ CNC Gold Water Bottle Cage Holder Bracket Mount For Brompton Bike - DinoKiddo
Free Parable monkii Clip B - For Brompton - Fits monkii cage, monkii mono, monkii V wedge : Amazon.co.uk: Automotive