Another tip I acquired over the years of touring is Lobster Brand adjustable wrenches (Hybrid adjustable angle wrench?UM - Wrench - General handtools - Products - LOBTEX CO.,LTD.) from Japan are the lightest and open the farthest for their size allowing to use the cassette tool to both tighten the cassette and tighten/remove disc brake rotors out in the field. Webbing also makes a good chain whip.