Originally Posted by
TiberiusBTkirk
A soft six pack cooler would seem to fit. I bought one with a removable hard liner so it stays put, cut some holes and zip tied it to the rack. A soft cooler like mine costs me $3.
That's exactly what I was going to suggest. If it doesn't come with a hard liner you can probably make an interior "frame" for it out of coat hangers. Then all you'd need to do is maybe glue or stitch on a clear map pocket on the top.