I've carried the leather version of Levenger's shirt pocket briefcase for over 10 years (actually, on my second - lost the first somewhere. I carried it more when I wore a suit jacket every day - I find it gets left behind in the very casual work environment of today (although I'm tempted to wear a vest like one of these just to carry all of my gadgets and gear (instead of resorting to a utility belt): http://www.tilleyendurables.com/detail.asp?catId=13&gender=m&extractBy=CategoryId&id=9&productNo=CL55