For a few years, you need skills. Can't put those in a pack. That's for tools and a well built redoubt are for. But that's getting into black 'copter land.

Still, if I ever become insanely, filthy rich, one of the things I want to do is buy an old missile silo, and make it utterly water tight. And inside, printed on something that won't degrade for a few thousand years, there would be books starting with C-A-T is cat with the picture above, and working on up from there until you are into 1960 or so level technology. Most of the advanced stuff would be on something like microfilm that can stand the age, probably some kind of optically pure glass with buckytubes to form the text (no, I don't think cheap), along with readers that will work on candles. (It can be done, you use mirrors to keep the soot off the lenses and film- still working the patent search for it.)

And seal it, walk away.

Then again, I am the guy who suspects in a past life he worked in the Library at Alexandria, and probably died trying to evacuate the more interesting parts of the collection. <img src="/images/graemlins/grin.gif" alt="" />