A Bagallini RFID Mini Cross body bag, fits my iPhone on the back for easy access and inside a small pouch to fit credit cards, few mints and lipgloss. Easy to get through security and also water resistant if it starts to rain.
A second vote for checking out bagallini. I’m a fan of their everywhere bag. It’s spacious but light. There’s a pocket for a water bottle. Good zippers and pocket locations.
I’ve been able to fit a light jacket into it without it feeling cumbersome.