I have a front rack and panniers on the bike I ride most, a Bike Friday,
small wheel so I can carry stuff on top of the filled Panniers

the touring panniers, all 4, when I do a grocery store stop The Koga Trekking bike.

Brompton , working on a bigger ledge, on the bottom-front, of my Steel Bag support.
to make a way to carry wierd stuff.

Or Touring Bag with the current Nylon/ aluminum tube bag frame..