On my European Walkabout, my day pack was stolen while I was sitting in a cyber cafe in Barcelona. If only I'd been using my cable lock! I was pretty good about locking my bag to the tale while I was travelling, but that day I forgot. In any even, a cable lock like the one pictured below (originally designed for locking skis and snowboards to a rack) provides a handy way to secure your personal belongings so that your personal items don't wander while you're sitting in a cafe/airport/train station/etc. While it certainly won't stop somebody with tools and time, a lock like this provides a great deterrent against 'snatch-and-grab' thefts.