The most useful thing that I think is the Basketball. This MVP lets me use my free time with friends on a 1 on 1 game. James Naismith invented the wonderful Basketball because he thought that it would give people 1 more thing to do.
This is what a basketball looks like. It is sometimes made of synthetic rubber and leather. The inside is made of butyl rubber and the carcass consist of thread of nylon or polyester.