Most of the multitool kits I carry with my bikes have a chain tool. My only advice to add is to make sure the one you carry is of good quality. I've found it's easy to misalign the pin driver when you use cheap ones, and you end up driving the pin in or out of the chain at an angle. Not good! That flaw once caused me a chain failure after only 20 miles. The misaligned pin had ovalized the holes in the side plates which caused the pin to pull out. Chain puked out onto the road and I became an expert spinner, real fast