I originally purchased tote bags from Wal-Mart without measuring the diameter of my planters. The bags were too small and did not work. After I measured them, I chose between several options on
Amazon and these fit really well -- so well, in fact, that I didn't even have to attach them. My plan had been to use some elastic cord,
similar to this, around the top of the tote bag to hold it in place.
First, tape off your chosen design. I went with basic stripes and taped the tote bag directly to the floor. This kept it from moving around as I worked.