Two invaluable things in a survival situation are a warm fire and a sharp knife, and CRKT's Spark'N Sharp Fire Starter/Knife Sharpener helps with both. This compact tool features a tungsten carbide sharpener that extends from the end of the handle to put a fast field edge on your blade.
On the other end is a magnesium fire steel that comes out of the handle completely, but remains tethered to it with the lanyard cord. With the steel removed, the carriage that holds the sharper slides out the opposite way to reveal a piece of steel to use to strike a spark. The lanyard comes with a sliding barrel lock to allow you to wear it around the neck or hang it from your gear.