I carry a powerbank and various USB C adapters so if someone’s device dies I can help them out. It is a lot cheaper and smaller than carrying around seven different cables.
On top of that I carry Tylenol and bandages.
I used to carry a full first aid bag but kept forgetting to restock on supplies.
I got a thing an Amazon where the tool folds inside of a little piece of leather so it doesn’t get bent up or stab me in the leg