Change of cloths. My ride to work is somewhat challenging (only 4+ miles, but over 700' climbing) and I'm a heavy sweater, so a change of cloths is a must for me. I wear cycling/spandex shorts under thin/technical/MTB cycling shorts. Long spandex tights in the winter. On top, it's a t-shirt, with light shell jacket if cool. I change into business casual clothes after I arrive and cool off. I'm at work ~30-40 minutes before I have to be presentable. It takes me 5-6 minutes to walk from my classroom to the bathroom, change cloths, drop by the office, pick up my attendance log, and meet the class on the yard.