Their are still around but loosing popularity. Today you really don't need an external frame as the internals now come in large by huge sizes. Gregory has a internal frame pack that is 7000 cubic inches. The great thing now is that with new technology gear is getting smaller and lighter. The need for these behemoths is getting less and less.People would usually tell you that external frame packs are thing of the past but I don't think so. For long expeditions you need a frame that you can lash your big stuff too.