What do you carry to be prepared?

[fun in dirt]

This past weekend I was trying to organize all the stuff I carry around in my Blazer & at least get it all tied down. I like to be prepared for a possible breakdown or spur-of-the-moment offroad adventure, so have a couple of big ammo boxes full of junk: recovery gear (straps, shackles, hooks, gloves), jumper cables, tool kit & big zip ties, fire extinguisher, first aid kit, toilet paper , jacket & blanket (it gets cool some late nights with no top), spot light, big tarp (if get caught in big rain), qt of oil... What's some of the stuff you don't leave without?