I grabbed one of those umbrellas as well. Have taken it into court houses, flights etc. No issues ever.
Just feel better with it.
I have a 26" baton in the car. I may go back to a bat (with a glove and ball visible).
Also have this small one in my jacket.
Blades Canada - Warriors and Wonders - Vancouver, BC Smith & Wesson BAT12B Mini 12 Collapsible Stick - Black [SWBAT12B] - **This Item Cannot Ship Outside of Canada*** 5 3/8" closed. 12 1/2" open. Black STKM11A carbon steel handle. Stainless shaft, pocket clip and cap. Black elastic nylon sheath...
www.warriorsandwonders.com
It's under 6" closed and can pocket carry it.
Overkill probably but like knowing it's there.
Sadly lost my dog to a dog attack and since then started carrying go make sure that never happens again.