I made a small handful of these day bags based on one of my favorite bags.
It is 10 1/4 wide by 7 1/2 inches tall by 2+ inches front to back. The bag’s made out of vintage sails sourced through a buddy in LI, NY and built by hand in Brooklyn. Each one is different because of sail and sail positioning. They use sail cord, brass hardware and YKK brass zippers.