The Nalgene bottle kit is a great idea. I especially like the ability to include a cup for cooking etc. Thanks for working this out -- it's now in my list of lists.

Thoughts about the kit...

Do you wear glasses? If so, maybe you could add a spare pair of glasses. Maybe a Fresnel lens for general magnification, too.

Tweezers?

You might have room for a neckover. It's not much, but small enough to consider for added thermal protection for your noggin. It could go outside the bottle inside the sack, or maybe in place of the sack.

I didn't see any writing stuff -- pen or pencil and paper for leaving notes and stuff. You could include a cheat sheet, ID, etc.

Money?

I sometimes include glucose tabs in place of candy.

That's all that occurred to me.

Bear