Just my pockets it's wallet, cell phone, keys and vape.
With one of my two main messenger bags - the extra large TimBuk2 or medium Tom Bihn The Maker's Messenger Bag - all the above plus - earbud IEM's, 3 pair disposable contact lenses, business cards, pens,various charging cables, charging battery pack, vape juice, flashlight, knife, business cards and SD memory cards (these bags also can hold my camera so I permanently keep camera things in them), AA batteries for flash, spare camera battery, prescription meds for 2 days.
Then when I jump on a bike in goes a Tom Bihn carrying bag with a spare tube, tire levers, front and rear lights and a bike multi-tool.