On the bike...four heavy stackable steel CD racks.
A quick comment...I was on my way home from church this morning when I spotted these four racks at the curb as trash. My son, who has an ever-expanding CD collection, is in need of a few new shelves for them. Perfect. They are a simple design and made of heavy steel construction. If I were to purchase them they would likely have been expensive. My point is, I suppose, it is really handy riding a bike as an "everyday bike" that also has the capability to haul stuff...you never know what you'll find along the road.