I am afraid it is going to have to be a dreaded pirate for 2014 - A Dreaded Punked Up Pirate! Unless of course it snows in which case it will be Franz Klamer.
First - Don't panic. Whilst the situation might have changed after recent events at Boston there have always been a few spare bags available at the baggage areas. Failing that use another large bag - I would suggest a relatively clear one to avoid any possible suspicion, or attempt to find another runner who will not need theirs. The important part is to ensure that you have the sticker to attach to the bag.