In addition to my firearm, a carry a Surge Leatherman, Streamlight Station DS HL, and a spare mag with the first 2 rounds the CCI snake shot.
I use the Leatherman and light for something everyday.
Someone mentioned, to many things and trying not to forget something.
I used to be terrible at this until I started doing my “lucky 7 pat down check”. I count and audit my 7 items when I leave the house. In addition to the 4 above, my cell phone, keys and wallet. I have never forgot a thing since I started this counting, years ago.