First, I found a tube the right diameter and covered it with a cotton batting cushion and then grid paper. The cotton batting allows me to use straight-pins to anchor the thread in line while the macrame knots are tied. The tube is on the neck of a wooden bottle, which gives it weight and stability.
The bright red working-cord at the top will be replaced with a kumi-himo cord in the same color as the bag.
Come back later for pictures of the finished bag.