Slash and run theft is pretty much what it sounds like: a thief cuts your bag (or backpack, or camera) strap with a sharp knife, grabs it, and runs. Or they cut open your backpack, snatch the contents, and make off with them. Slash proof bags have wire embedded in the straps and fabric, making them extremely difficult to cut. Slash and run is less common than pick-pocketing, or scams that involve distracting tourists in order to steal from them. Still, it's nice to know that you're protected.