There are a lot of things in my kit bags that aren’t really related to photography as well as things that are. Some of the things are in different bags, my studio bags include things like bulldog clips & various other clips, self adhesive Velcro patches & double sided sided pads & gaffer tape. Most of my daily use bags contain things like, 12v Power converters to charge USB-C & Lightning devices, there are a variety of tools including a Leatherman & Gerber penknives and headphones (some are bluetooth others are wired). In every bag though are business cards, notepads & pens. In bags that will hold a lap-top then a portable SSD in a caddy and various leads, USB-C to Ethernet, USB-C to HDMI etc & particularly useful at this time of year a torch (I have a variety a couple of LED Mag-Lite and “No Dads”.
There are things that don’t live in my bags, but get added on an “ad-hoc” basis, including an I-Fix-it tool set, spare Manfrotto Tripod plates, Pocket Wizard Radio Remotes, colour checker cards etc.