Airlines enforce a 3-1-1 rule: liquids must be in 100ml containers within a quart-sized bag.
Knives, scissors over 4 inches, and sports equipment are prohibited in carry-on bags. Verify airline rules before booking a flight.
Power banks and spare lithium batteries must go in hand luggage. Check airline watt-hour limits for safety.
Keep receipts of duty free liquid items you bought and ensure they are in sealed, tamper-evident bags to pass security when connecting flights.
Most airlines permit one carry-on and one personal item. Check size and weight limits to avoid fees.