For decades I've used a small kit strategy of making a mental note of when I need a tool that is not currently with me and I'll add it to the kit if I'm in this situation three times.

There will be some items that I don't often use or maybe never used since I built the kit, but don't take much space. I'll delete some of these ancient items if I need the space.

Laptop is a separate given.

In addition to a network toner and VOM, there is an assortment of small hand tools, including a level, and a flashlight on my belt. One of the more bizarre items is a 15-Ohm 1W resistor in case I need to load a tube amplifier. I haven't used this in years, but it is small.