Ortlieb Ultimate 6 Handlebar Mounting Bracket, Locking for 22mm to 31.8mm Bars - Modern Bike
Best handlebar bag adapter Klickfix for Vaude and Ortlieb/ Túi ghi đông xe đạp - YouTube
With Klickfix handlebar mount (fold-comply) there are so many handlebar luggage possibility (Vaude/Rixen&Kaul/Ortlieb etc). Got an old Vaude from my touring bike fitted on Bromp : r/Brompton
Brompton Ortlieb Switzerland, SAVE 49% - loutzenhiserfuneralhomes.com