I don't like bags, but prefer a toolbox my self. I use a Stanley 23" one, with wide metal closures. You can sit/stand on it, the tool tray does not take up the full width, allowing cans (WD40, silicone, grease, etc) to be on stored on one side and there is a slot at the top for a carrying a level (or other long things) and it can be use to hold things you cut.

Due to the square shape, also easy to stack with other stuff.