I carried my lunch in one pannier and my work clothes in the other. Of course, my lunch was in a soft-sided cooler. These buckets are HUGE. (okay, maybe not that big, but they do hold a lot.

) And, I still have the option for a trunk, should the need ever arise.
The mile crate idea is cool, but I'd opt for a bungee cargo net on top, just so things don't disappear en route, especially on one road I ride.
The only bad part of my ride: