I love this one. I fill the bottom third with rice (uncooked, you won't believe how many ask that and yes that is a dumb question) . I have small ones and big door stop ones! They will not roll or tip over.
http://www.fatquartershop.com/Free-Q...incushions.pdf
I made it simple and more useful for me. I don't add a tie, I use a big safety pin to hold the two ends together and fill that pin with other safety pins.