Christmas was expensive but this is a steal:

http://www.newenough.com/firstgear_fuel_jacket_page.htm

This one is also a steal!
http://www.newenough.com/vanson_c3l2_jacket_page.htm

I got one for xmas. I can tell you that the "glow" feature really does work when recharged via sunlight, headlight or darn near any electric light.