Best for the Emergency Kit

LuminAID Solar-Powered Inflatable Light

You could donate a LuminAID as a self-charging light source for those in need for $10, or buy your own for $20. But why not do both with the Give Light, Get Light Package? With yours, don't just stuff it in your disaster kit. Packed up, it doesn't look like much, but stick the attached solar panel in the sun for seven hours and then inflate it - yes, inflate - into a waterproof, balloon-like lamp that will provide light for about eight hours on the highest setting. Push the power button, and you have perfect LED light for hanging out and even reading.
[$28; luminaid.com]