I had been looking for one of these for a while and had tried this and that to keep my stuff handy without having to stop and take my pack off, especially in the winter. I could only find used ones on e-bay since Dana Design stopped making them.
It seems that the guy (Dana) from Dana designs started Mystery Ranch and they announced today (I had been emailing them to see when they were going to release this) the "new" Wet Rib.
Unlike the previous version the new one is only in one size and it looks like there is only one for the left side of the pack. Its a start though.