A gym bag full of wet clothes. A canvas bag containing--among other things--two books, a magazine, an extra camera, and a few pens and pencils. Eight small wine glasses, two Indian meal moth traps, and a red reflector on a 4ft/1.2m stick (for the front yard, not the bike). And also a full cup of hot coffee in the handlebar cup holder.
To see more in the Things That Can be Carried on a Bike series, click here.