Bicycle OCD is pervasive around here. I was going to just attach my white Sterilite milk crate with zip ties but I decided I wanted an easy on & off setup. Several iterations and unknown hours later this is what I use:





I cut a slab of 3/4" pine shelving board to sit on the rack and attached a couple of blocks to fit in the openings in the rack. The back block has a plastic tab made from the cover of a 3 ring binder. That tab fits under the end of the rack and the front is held down with the bungies. The rubber is just some old inner tube so the the paint won't get chafed. Works great.