Mix Cement with a Tarp

I am always interested to learn about new uses for your tarps so when I stumbled on this video that shows how tarps can be used as simple cement mixers, I thought I would share this. I think, ideally, you want want a fairly long tarp for this so you could roll the cement a few times before you have to change direction. Perhaps something like a 10' x 20' tarp would work well.