I have a small pouch, just one compartment, that fits in my back pocket. I keep any relevant cards (ID, credit cards, etc) in there as well as the things I like to have on a daily basis like my earplugs (because noise sensitivity is a fucker), mini multi tool, lighter, my meds, fidgets, and whatnot.
On days when I have more stuff I want to bring, I have a Lunchbox backpack that’s actually a really great size for day to day stuff but isn’t a massive backpack