One of the best things you can do to be prepared is to mentally plan the actions you would need to take in an emergency. As part of this plan, count seat rows between you and at least two exits. If you have any questions about the safety procedures, ask the flight attendant. None of the injured had their seat belts fastened. Make sure their seat belt is secured snugly and low across the hips.
Most airlines restrict carry-on baggage to two pieces per passenger.
Carry-on bags must be small enough to fit under the seat in front of you or in the overhead bins. It's a good idea to put the heavier items under the seat. Carry-on items could become flying projectiles during turbulence. Heavy items and baggage with sharp corners can be hazardous. Some hazardous materials are restricted.