Originally Posted by bluepig1

I was told the same on a recent CRJ-200 flight between ORD and MDT (can't recall if this was on the outbound or return, but I think it was operated by SkyWest) - I boarded late at the end of the boarding process and despite having a small carryon that would normally fit in the small overhead bins, the bins in First Class were full. The gate agent told me she had to affix the green tag.