In college my job was to be Ricky Rescue.
Got EMS training and given my own personal jump bag in exchange for "just being around." (Didn't have to run calls, but of course, by proximity and a yell from the other side of the hall, I would be there before EMS).
For a time I was enthusiastically adding to it-- triage tags, OPA/NPA, bright orange vests, PCRs, biohazard containers,... then I realized-- for what?
I still have that kit so I leave it in my trunk, but I haven't had much use for it besides the time I got a paper cut.
It will really only have use if I happen to drive up to an MCI, be first on scene, and yet not suspect that my life is in danger
However, for some people this is a work/life balance thing, whereas for others it seems that it's all about preparing for disaster. Both make sense to me. I'm not as experienced as others, so take this post with a grain of salt (or a few mL of normal saline will do fine).
I personally always carry a pair of gloves and a face shield (enough to deal with A-B-C until help arrives), and since I'm not naked in the Sahara Dessert, I'm told I have all the tools I could ever need.