I saw some bloke with a Brompton that had straight bars and a pannier this morning. That surprised me because I thought the straight bars were incompatible with the pannier. When I asked him, he said they were incompatible with the larger pannier, but you could use a smaller pannier. Later on, I started to wonder why this was so. Surely it is the bracket that would interfere with the folding down of the handlebars, and why would the bracket be different? My other question is if it is possible to retro-fit the straight handlebars to a bike with standard bars. It would look better with the stubby bar ends.