The first time you see a shibori (how to pronounce: shee-BOR-ee) bag up close, it does not read as handmade. The blue is too deep and the white is too clean. It looks printed.
Here is why you can make one anyway. You are not putting the pattern onto the bag. You are hiding the parts you want to stay white, and the indigo handles the rest. Wherever cloth is pressed tight against cloth, dye cannot get in, and that untouched cotton is your pattern.
So the skill is not in your hands. It is in the folding, and you have been folding things your whole life.
That flat cotton tote you got free at some conference and shoved in the back of a closet is a perfectly good place to start. It costs you nothing if it goes sideways, and it probably will not.
The small wobble in a hand-fold is the part that makes a bag look made rather than bought. Mine are never quite even. So far nobody but me has ever noticed.