What is the most useful object you carry around with you?

Potentially my Mighty Wallet - https://mightywallet.shop/collections/classic-mighty-wallet/...

The rulers on the edge have come in handy the most.

Pocket knife. Clip one in your pocket for a week and you will be amazed how much you use it. I always have a cheap Gerber or nice Kershaw on me.

My planner. My whole life is there.

my greyman/lil'basterd kit

iPhone.

Oh, my Leatherman (Skeletool/Wave, depending on the day).

tight fitting cloth work gloves that don’t obstruct writing

Pencil and paper

Pen

My soul :)