I regularly dive vintage back paks in between diving plates and ccrs and bcds and harnesses I make for sidemount
and there really is not much more liberating for a quick single tank splash than a plastic pak of course in the ocean
The tank boots I do wish I had more of them to deaden the bell sound of all my aluminium storage of other gasses general use, also emergency O2, and all sorts of cylinders, when I crash them into my shiny pristine concrete floor
Now also considering that we are in the vintage forum of vintage things, the only thing worthless here is your post