I am surprised that
generic-man did not include an
obligatory Simpsons reference in this
writeup. So, I'll do it.
Maude Flanders was killed by a compressed t-shirt fired from a promotional cannon at close range.
Also, I believe I have seen infomercials for assorted "t-shirt compressing machines" whilst channel surfing late at night. They usually involve some sort of vacuum and a bag with a special gasket and airlock. I imagine they're a good deal if you travel a lot or have limited storage space, but you might as well just try the old-fashioned and far cheaper solution of cramming things in your suitcase and then sitting on it until you can zip it shut.