On a recent AA flight the gate agents were yelling 'one carry one bag and one TINY personal item only'. They said it about 50 times.
They meant it.
It was a full Super 80 not a regional jet.
The folks that had too much stuff were forced to gate check items.
I had one under seat size carry on (RedOxx Gator bag) and a tiny purse and was OK. The purse would have fit into the Gator bag if necessary.
This is our future folks.