On my last trip, I found myself in the horrible situation of being on a plane with no means of powering my various gadgets. Back in steerage (um, I mean "coach") on Continental, you can't count on having one of these 12V sockets anymore.
So I was thinking about a very lightweight battery pack with 2 or3 12v cigarette lighter outlets on it, powered by 4 CR123 batteries, and perhaps a powered USB port for those devices that charge via their USB cable.
As far as I can tell, there is no such device on the market yet.
Does anyone else have some input on this idea for a VERY light, airline-freindly power pack?