Use the "bag" of tools that you intend to carry for all your regular maintenance and pre-trip tune-up. That way you won't forget anything and you may find that some of the "lite-weight" or "multi-tools" that you were planning to take don't work very well. i.e. I once needed to tighten my crank bolt to stop a creak, if I was relying on the 2" long 6mm hex key with adapter in my Topeak Alien I'd still be there trying to fix it.