I use a one-handed up-down with a modified twist-swirl motion with just enough liquid and twist-swirl to keep the ball from hitting top or bottom. I have never double, or triple balled, but with this technique I have had the same fully functional and intact ball for a year and half with no rips or tears. Wow, that does not sound like I am describing an aluball shake....
I like the idea of the plastic bag. I sometimes after several uses in a night find that the rim gets wet and/or small particles on it. This tends to make it not seal tight and leak when shaking. Just fine if I spend the time to clean it out, but you know I am usually already 2-3 aluballs in...