Thinking about a plastic pipe I can carry in the plyer pocket, drill a hole for a lanyard.
Choose a small one so your assailant will have a hard time beating you to death with it. If legal, get the spray but be sure it's ok with the local authorities. Maybe just an air horn. Might scare the bejeebers out of them without getting you arrested. And stay out of bars after the dinner hour. That alone can eliminate a lot of risk.
