What you carry and how you do it depends greatly on the length of your commute.

For example My commute is a mile and a half so during the winter i just layer under my work clothes.In the summer, however I carry a towel and washcloth as well as my work clothes in a larger zip lock baggie. When I get to work, I rinse/wipe clean, and apply deroderant and a light body spray in the mens room then change. noone notices the difference as far as odor goes. Make sure to completly change though. socks and undies get sweaty and at best uncomfortable at worst stinky . other than that make sure your ride is equipped and up to the miles. It really is fun to see the look on faces when u come in out of sub zero tempatures or a torrential downpour comments like did you ride this am are fun to answer.