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.
Sheath knife around neck. Originally for self defense, but way useful for other things.
Self offence?
Tiny handle, small, would be to slippery to handle with blood involved.