Because the parts are much smaller than those found in the family car and household appliances you'll need to make sure you have the smaller precision tools for much of your repair and maintenance work. A pocket precision screwdriver with multiple bits, a precision adjustable wrench, and a folding set of hex wrenches minimize toolbox clutter and are usually sufficient for quick repairs and maintenance.
You'll still need some regular-sized tools but save space by getting a regular screwdriver with bits instead of lots of separate screwdrivers and a needlenose multi-plier or Leatherman that has extras like wire cutters, scissors, ruler, pick, or screwdriver built-in.
Power tools are nice to have but if you want to save money, go with just a rotary tool with lots of accessories (compare prices). A temperature gauge, a digital multimeter (compare prices), a fast charger and a basic utility knife can be invaluable tools.
Keep a small amount of the most essential supplies such as tire glue, battery packs, shock oil, air filter oil, after-run oil, an extra crystal set, a spare glow plug, and some fuel on hand. You don't want to have to run to the store each time you want to take your RC for a spin.
Balloons and fuel tubing are similar to duct tape in the many ways the RC owner can use them and they take up very little space and don't cost much either. Commonly used to cover and protect the receiver, balloons can protect other internal parts including battery packs, servos, and shocks. Fuel tubing can also be used to protect parts of the RC.
Plastic tie strips or cable ties are handy fasteners. They can strap the receiver and battery packs to the chassis, help organize wires, and fasten other parts within the RC. Little cotter pins, typically used to attach the body to the RC are easy to lose so having a few extras is always a good idea. In a pinch, try paperclips. And if you know a specific part on your RC is prone to breakage, keep extra parts or fix-it supplies on hand for that specific case.
This may sound like a lot of tools and supplies but it's really just the tip of the iceberg or the top of the toolbox. For more to put in your toolbox explore these basic, standard, and ultimate toolbox setups.
