Five days and counting--how to pack?

Three weeks, three countries, how to pack?  I decided, based on the advice of others, to go light.  The goal is one carry-on suitcase and one messenger bag to do double-duty as camera bag and purse.  I found a suitcase that will work nicely, but it is just plain black.

I decided that I did not want a plain black bag.  A trip to the craft store, a little fabric glue, and, as the French say, voila!

Now to figure out what to put in the suitcase...five days and counting!