Originally Posted by TRRed

As a more drastic step, the airlines could issue one "overhead bin baggage tag" at check in (maybe 2 for those in F where there was extra space) to be attached to the item the pax intends to stow overhead. Any items placed overhead without one of these tags could be spotted easily and removed by the FAs if space was needed, so that those in the order last to board had a better shot at proximate overhead space.