Alvin Huey was wearing one of these on the Monday evening and I was like 'what on earth's that?' and he invited me to try it. I was impressed at the convenience of it and, as soon as one became available, via Jimi Lowrey, I bought it for the bargain sum of $60 and used it for the rest of my time at TSP.
These vests are made by Dragan and Anja Nikin and for more about them, here's the blurb on Dragan's website, where you can order one. I am not one for hype or overt advertising, but these vests really are pretty brilliant.