If you are a constant traveler (and even if you aren't), you know that time is of the essence. In order to avoid spending precious time folding shirts, here is a trick to have it ready and folded in just three seconds!
The first thing you need to do is to pinch two inches from the collar, and with the other hand, pinch about halfway down the shirt on the same line.
Then, without letting go, fold the top hand over the bottom hand and grab both layers at the bottom of the shirt.
Again, without letting go, bring out your bottom hand from underneath.
Voila. Lay the shirt flat, fold it over once more, and it looks like this:
All Pictures Courtesy of Mariana Hellmund