-
I have 2 brommies (well a Brompton and a Merc). One for me and one for the wife. I have a Merc framebag with a welded alu frame and a blank Brompton frame which I attached an old Army Surplus kit bag too. Its surprisingly good, although its missing the rear facing pockets. I'll do the same once the old Merc bag dies (its not the toughest material).
My original intention was just to mount my Super C saddlebag to the frame but its not quite big enough and I use it on other bikes. Brompton made bags are great but they're terribly expensive.
Apologies for the shite photo.
Best bag for a Brompton - thinking one of the Carradice city range, tote bag or roll top