Back in the days when I use manual film cameras, Cokin introduced their creative filter system. I was able to use the same filter for different size lens diameter. Of course this was a little more hassle to use than the standard screw on filters, but this was one of the most economical systems available; just having to buy one set of filter & a ring mount for each different sized lens.
I know that Cokin still produces them but in the recent years I've not seen a single person (that I know of anyway) using them. Any reason for this?