My RTV 1140 fully decked out with tools, lights and supplies, to transport me around the ranch.
On my person.
Cell phone with photo, phone, video, mapping, text, note taking for router codes , weather alerts, alarm clock, calendar, time, calculator, etc. capability
billfold with money, plastic, spare car key, identification, CCL, social security card, insurance card, etc.
Kel Tec PF9
Leatherman SURGE with diamond sharpener, 20 extra bits for screwdriver, hex driver, etc., tweezers, all in one belt holder
2 key chains for all the vehicles, houses, etc. that I need access to.
CREE LED flashlight in belt holder
belt for leatherman, flashlight holders, hold pants up.
All these things frequently keep me from going back and getting other tools and allow me to be prepared for unanticipated or planned activities. These things are less than 5 lbs total....keys, Leatherman and PF9 are each about a lb each. Flashlight plus phone is about another lb.
I have thought about it. I honestly don't know anything else (light) which I could add to this package to significantly increase my ability to communicate widely, be safe, perform chores, move about the ranch, house or town, remember things, know things, etc.