I got this one because it is long enough to hold full size brushes. It's honestly bigger than I expected it to be. There isn't anything you can't carry in here but it also gets to be a little much if you're planning on doing some sketching outside or wherever. If you aren't so much concerned about weight or space, I would def recommend it.. I'm personally more on the minimalist side of things though.
My main bag is the Field Easel Art Bag from Darsie Beck and like it quite a lot. It's a really great size for walking around town and I have plenty of room for a simple watercolor setup.