I just carry the basics for everyday use, on my keychain: 3x house keys + 1 car key
In my pockets whenever I leave the house: Wallet, smartphone, Leatherman Micra or Squirt, Fenix E01 1-AA LED flashlight, small Kershaw folding knife, Kleenex tissues.
This has served me well for the last few years, flashlight is handy when walking the dog at night, knife for opening letters/packages, and Leatherman for misc tasks. Everything else is self-explanatory. I went with small versions of everything to keep the weight down. Oh, and I always keep a couple of Band-Aids in my wallet, you never know when you are going to need them.