This very packable bag from YNOT is SUPER minimal, very simple, and a favorite choice of mine for packing away into a larger travel bag for daily use.
I get into this bag at 1:30 in this video:
Be sure to check out the list of my favorite packable daypacks.
Other Bags to Check Out:
The Day Tote from Qwstion is a remarkably designed bag that's surprisingly awesome to use.
The second version of this bag is a welcome update, creating a much more stylish looking bag with plenty of organization for daily carry.
The Classic Backpack Plus from Bellroy has a clean aesthetic, lots of organization and some excellent build and materials... well suited to be your everyday carry for work.
The Aer Duffel Pack is not the tool for every job, but for particular uses it just might be perfect for you.
The Atlas Executive Holdall from Waterfield is an excellent large-ish capacity shoulder bag designed to help you shift seamlessly from tech gear to gym gear.