The Pak Lite. This is a nifty little flashlight has been used by the US Military, FEMA and the Red Cross. It weighs 1.5 oz. and just snaps to the top of a 9 volt battery. The battery itself becomes the flashlight "case". Models range from about $13 for the very basic Pak-Lite to $30 for a multipurpose Pak-Lite that meets military specs.
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