The Highgear Multi-Survival Module. 3 oz, $19.95 and very very crafty. Compass, loud whistle, LED flashlight, signalling mirror, magnifying glass, match compartment, thermometer.
Safety mirror swivels out for use as signaling device. Magnifier can focus the sun to light a fire. Watertight compartment on the back keeps half a dozen wooden matches dry. Digital thermometer switches from °F to °C. All in a sleekly engineered, indestructible case!