I have an Interchange rack. it's not my favorite rack, but some of the trunks are neat. My commuting "panier" is actually an Interchange trunk that has two compartments on the sides that unzip and fold out into paniers. The trunk holds all my tools/tubes/wallet etc, and when I need a bit more room food or close, I unfold the sides and viola.

I'm not saying it's the best, but it definitely works for me.