Constellation guide?

I've been hunting like crazy for a 'pocket-sized', 'lightweight', or 'backpacking friendly' book that covers constellation information: location, history, mythology, etc. Does anyone have any good recommendations? Forever grateful if so!

You bet!
The Audubon Society Field Guide to the Nigh Sky
http://www.amazon.com/National-Audubon-Society-Field-Guide/dp/0679408525

I'm an avid scope builder and astronomer and this field guide has what you want.

You might also pick up a planisphere.
http://en.wikipedia.org/wiki/Planisphere
There are small versions that pack well.

Kindly fill out your profile so we know where you are and what you are into.

I agree with the Planisphere. I love mine. It has a dark background so you don't go blind if you are using a flashlight (or you could use a flashlight with a red filter on it). It is completely flat, so you can slide it in your pack easily.

The iPhone has the StarWalk application.

Absolutely mind boggling.

While not a book, the free app "Stellarium" is pretty darn cool and will help you learn more about location, history, mythology, etc.

It even runs on a Mac

Bill