I think i'd sign a petition for wheel-on *only* (and all one sized). The amount of times i've been sconned in the head or knees by people with huge duffle bags or oversized handbags as people sling them over their shoulder and just barge down the aisle towards their seat without regard for who they're hitting, i've lost count of!I would also add "Don't have wheeled carry-on luggage." These things are the bane of my life and I think passengers should require a doctor's certificate to be allowed to use them. Also, I thought this was an Australian website. When did we change from queue to line?