I commute 2 miles to work 3 days a week (when school is in session). On the days I drive (due to second job) I pack in my clothes, shoes, etc for the next day and lock them in my classroom closet. I keep a washcloth, soap, deodorant, etc in my closet at all times. So on the days I do commute I simply have to carry my lunch and any papers I carried home with me the night before to grade. At the end of the day I simply pack my clothes, shoes, etc in my panniers for the return trip home.