Elaine- great feedback!
I think the drawstring ones are mostly for containers, which allow for the covering without worrying about having to figure out how to secure it. After the initial fiddling to get the string pulled through properly, I did like it better. I can see using the same plankets for the same containers time after time and it would be quick to pop on and off.
I hear ya on the color. They are promoting the green as less intrusive- I suppose for when we forget to take it off first thing in the morning, we don't embarrass the neighborhood by having white rolls everywhere