In Just a Few Hours--heading to St. Louis

My train departs in a few hours, and I am frantically trying to pack everything I will need for the next month. Anyone who knows me also knows I do not travel light. Even for a weekend I pack an entire suitcase: three pairs of shoes, about fifteen pairs of socks, three or four pairs of jeans, shorts, at least five shirts, and all the products I could possibly need. How am I going to fit all of this in one duffel bag?