Hmmm....
I would use my Camelbak Mule, which would contain:
1. water of course (2 liter bladder)
2. steel cup for boiling water
3. 5-in-1 cooking set
4. the ALMIGHTY spork

5. fleece sleeping bag - very light and not too hot or heavy for my Texas climate
6. compass
7. Light My Fire and matches
8. Small 150 hour flashlight/lantern combo (takes 4 AAA)
9. Glow sticks just because they fit (and other purposes)
10. Food: trail mix, slim jim, jerky, oatmeal packets
11. sling shot - small, portable, and ya never know
12. Fishing kit: spool of 50lb spiderwire, few hooks - big and small
13. polar pure tabs for water
14. Gerber Big Rock for my fixed blade
15. Sharpener - spyderco double stuff
16. Extra socks and T-shirt
17. Atom head lamp for hands free stuff (cleaning fish in evening, sewing, ya never know)
18. First Aid Kit, snake bite kit as well
19. Cordage for tarp, traps, etc..
20. Tarp of course for sleeping out of the rain
All of this would be in the Camelbak Mule (the sleeping bag is strapped to the bottom on the outside). I would of course have my clothes on me, along with my EDC folder of choice and a Leatherman blast on my belt. I'm sure I forgot something, but that should cover it
Pics of it from my past uses: