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:
Smith the Roll Pack from Millican is a perfect eco-friendly rambler for daily adventures that's built excellently, has plenty of room for your stuff, but still looks good when it's not totally full.
The Wilderness Rucksack from Tanner Goods is a gorgeous, artisan, hand-shucked heirloom bag that your grandpa would be proud of (whichever one of your grandpas was more badass).
The Civic Half Zip (CHZ22) from Evergoods is a modern classic with just the right amount of organization and capacity executed with precision build quality and excellent materials.
The Tech Sling from Aer boasts a solid amount of organization and space for loose gear. Features a space for a 13" laptop.