I don't have much experience with shaving soap stick tubes, but I see there are a few. Do you have a favorite - not the soap, but the tube design? Which would be your choice for re-use if I was to make my own combination of soaps or melt & stuff some cheaper bar soaps into a tube? I found a DIY tube, which is currently out of stock, but I wonder if this is better than any current soap tube design, and if any currently produced tubes are sturdy enough for re-use.