No, I don't have it at hand or know if I could find it, but I know I have seen it and thought of making one.
You could try getting your bags together and measure, make a rectangle twice the size plus seam allowance. Put the ties between the layers and leave a small opening to turn rightside out. I would take a strip of fabic and tube it to lay down the center of the rectangle on top of the baggies. The bottom of the baggies go in the center, with the zippers to the outside edges.
Hope this helps or someone else has the directions.