What would you want at the end of the World?

An idea that's been mulling in my head for a while is the concept of the apocalypse kit: take a bag, say, the size of a regular backpack. Decide what you would want to have with you in case the world was going to end, or civilization were going to collapse. What things matter? What would you want to have with you to rebuild society? Think not only what would be useful, but also what matters enough that it should be included.

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Titanium Spork
Hermetically sealed clean socks
One of those water filter straws
A small flask of Nesbitt's
A sharp knife, and a corkscrew.
A roll of twisty-ties, and some duct tape.
A Knoppix CD
More to come

- ThomasKula

Shovel (for burying dead bodies and clubbing zombies)
Boy Scout Field Guide (it has lots of good info)
Hammer (you always need a hammer)

-Nick

why hasn't anyone suggested a towel yet?
--waldo

a flint and steel
a license-plate sized FresnelLens
Bar of Soap
pringles can
rope
plastic wire ties - the resuable ones - because it is the apocalypse and we won't be getting any more.
a bunch of those compressed t-shirts
leatherman tool
plastic garbage bags, there's bound to be a lot of garbage around.
inflatable atmosphere regeneration factory.
broken geiger counter - you don't really want to know, but you made an effort.