I made a couple of bags using Kraft-Tex for a sturdy bottom section a while back, and wasn’t that happy with it. My review is here, if you want to read it.
However, when I got some lovely bird fabric in a guild swap, I decided to make another tote bag and use Kraft-Tex to protect the bottom again. I pre-washed the Kraft-Tex to soften it a little, then crumpled it in my hands to soften it a little more.
I used a buttonhole stitch to secure the top edge of the Kraft-Tex. Overall, the Kraft-Tex was much easier to use this time. It makes a sturdy bottom for the bag, is washable, and presumably will wear better than a plain fabric bottom.
As before, the Market Bag tutorial was very well done and easy to follow. The only change I made was to revise the way the bottom was attached so that I didn’t have Kraft-Tex in the seams; that would have been quite bulky. I laid the Kraft-Tex on the top fabric and secured the edges with buttonhole stitch just inside the seamline, so it wasn’t necessary to have Kraft-Tex in the seams to hold it in place. That worked a lot better.
In other words, I am now revising my opinion of Kraft-Tex and probably will use it for this purpose again! It still does’t really look like leather to me, but in this case that isn’t the point.