Capsule solar lights

Now this is an interesting concept. It is an emergency light (LEDS) in the size and form of a capsule. It fits onto a package like surface (like real capsules) and there it is recharged by the solar panel. To use it, simply remove from package and twist and it has enough power to light up your surroundings (not totally of course). Now this is something that would prove to be useful if made into reality.