In preparation for a long journey, I usually adjust the points/timing, clean the plugs, adjust the drive chain etc. I put the tools I use for those jobs into a canvas bag and strap it onto the back, thereby ensuring I can perform similar tasks whilst on the road. On one month long tour of France I did a few years ago I also took spare inner tubes and strapped replacement cables to existing ones so that I could make a quick swap and save storage space.