Like your bag!
The ones I make are usually from upholstery or drapery fabric so I don't use batting or interfacing. I've made them in all sizes from small enough for just a cell phone to big enough to hold a queen size quilt. You could easily add batting or interfacing and do quilting however. The size and intended use of the bag determines how I do pockets and handles. I can make one in a couple of hours or less. I started doing them as a quick baby shower gift when my kids were little. Back then I usually used denim. Takes almost as long to write the instructions as to make one. Lol! But if you would like I can write them for you.