Raji, I only used one strand of NK yarn on my bag, and it was very sturdy after felting, it was amazing how thick it actually had become. As for the twisting stitches, I must admit

I forgot to do this, and was a little nervous, but it still turned out looking great. I also realized late in my knitting that there was a dropped stitch, we I repaired it, it did not look that great, but after felting it was not even noticeable anymore!