This goes into my tool box along with an 8 mm box end wrench (small and light), chain tool, spoke wrench, chain lube, syringe with Triflow oil, an assortment of replacement nuts and bolts, several zip ties, fiber-fix spoke, duct tape and a small rag. If the tour is a long one, I also carry one spare derailleur cable and and a brake cable. I also carry a small bottle of dish detergent and an old sponge. I don't need to carry a dedicated pedal wrench because my wife's S&S coupler wrench also has a pedal wrench. I've used everything except the spare derailleur cable on a tour. I dumpster dive for a soft drink cup or in this case a Gatorade bottle to serve as a mini bucket for bike cleaning while on tour. I use a water bottle to rinse the soap off after cleaning. I also use a lot of napkins and paper towels from cafes and gas stations to clean chains while on tour. Depending on the weather, I'll clean the bikes every 2-7 days.
All my tools and cleaning supplies fit in that plastic box. I want it clean and I want it working.