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 have a Swiss Army Card, it has a scissors, small knife and other tiny gadgets.
Oh, and a Light Saber! [pushes button and humming sound starts]