Yep, as above, I have the equivalent of the "flat bars" and I use the biggest Brompton bag (the T-Bag).
I've carried a bag full of groupset plus two wheels on the front bag alone. Sure, I wasn't doing any bar spins or turning them 90 degrees in a hurry, but I had no issues at all with the clearance of bars during the 6 miles of normal city riding that followed this pic.
Yep, as above, I have the equivalent of the "flat bars" and I use the biggest Brompton bag (the T-Bag).
I've carried a bag full of groupset plus two wheels on the front bag alone. Sure, I wasn't doing any bar spins or turning them 90 degrees in a hurry, but I had no issues at all with the clearance of bars during the 6 miles of normal city riding that followed this pic.