What are the best things to carry while travelling for 2000 KM?

Hi, I am an enthusiast and a professional photographer. I like to travel a lot on my workdays. Can anyone suggest to me which are the best things to carry while going on a trip of 2000 KM?

That’s a long way to carry something, I would suggest something light, so as your arms don’t get tired.

Serious answer this time…

It depends on where you are going, the terrain and the weather. Are you talking about spare car parts & tools or survival supplies?