Started out with a backpack as I explored the idea of commuting. Within a few months I'd gotten a Topeak Explorer rack and a Topeak rack trunk with fold out panniers which serves me well 95% of the time. Occasionally I use my pair of Axiom Lasalles on my front rack in addition to my rack trunk on the rear, or every once in a while use only the Axioms. The Axioms were purchased with touring in mind, but the extra space they afford does come in handy on the commute sometimes.