I'm coming to Chicago with a friend on a Wednesday to attend an event at Wheaton on Thursday. We arrive at O'Hare first thing Wednesday morning and the plan is to spend the day in the city before taking the train to Wheaton that night. We'll each have a large duffle bag, but don't know what to do with them during the day. Now that O'Hare and the train stations don't have lockers, what do you suggest?