In fact, I tried it today and it is so easy and saves so much space. Once you get the hang of it, it is really fast. I did my first one without any trouble, and I know I can do this from now on.
The post with the instructions and great photos is here atthis link.
What I love about this is that now they are so small, it is very easy to tuck one or more into pockets, purses, car door shelves, and any place that I need a few of these handy.