I carry lots of the usual stuff. Being an outdoor guy, I also have granola bars, water, a hat and rain gear, extra shirts, socks, and pants.

I highly recommend a Gorilla Power Wrench. Walmart has a similar no-name version.

I just picked up a Tundra Fire Extinguishing Spray at Walmart as an alternative to a traditional extinguisher. It fits easily in more places.

Mark