"Call me crazy, but I happen to like airplane travel…no, I’m not a huge fan of screaming babies, recirculated air, or stale snack crackers. Nor do I like lengthy airport security lines, accusatory customs agents, or the way that my equipment cases get beaten, mauled, and abused by the TSA whenever I travel from city to city. Nope, what I happen to like so much about airplane travel is that — each and every time I fly — that I always manage to walk about from the flight with at least two portable/foldable flash diffusers tucked away in my pockets."

Suhit recently posted an article that explains how to make your own
flash diffuser for built-in camera flashes using an empty film roll canister, but the article here explains an easy and cheap (if you don't count the price of the airplane ticket!) way of making a flash diffuser for external camera flashes with an
unused airline barf bag. It's funny that I came across this article last week since I'm headed out to Washington DC this Wednesday and should be able to get my hands on a few of these "flash diffusers" while in transit. I'll be interested to try this out for myself since I normally just aim the flash at the ceiling and bounce the light onto the subject of the photo. This seems to work well, but I wonder if the barf bag would work even better.