A few years ago, I made sixty (60!) fabric bags using a new, gently cut apart plastic grocery bag as my pattern. (And a pattern from Simplicity)
Here is what I learned. Cotton fabric works up great, but the cotton ones did not hold up well to all the washing they got. Woven polyester is nearly indestructible. (I used cheap broadcloth for a few of them) The simplicity was pattern was needed to figure out how to assemble the bag, and now I can make them any size I need. If I make more, I will try using all the double knit polyester I was given, and make them single layer with bias binding made from woven polyester. (Those polyester double knit pants never wore out.) I will post the results when I get around to trying it. Corvallis, Oregon, near where I live went plastic and paper bag free several years ago, so that was the impetus to try making them.
Here is a link to an easy quick shopping bag. Second hand stores here I come.
https://youtu.be/_Wj6yaTUvIM