Pilot explains why airlines have become so strict on luggage weight limits

Strict carry-on luggage weight limits are driven by safety and operational constraints, according to a pilot turned aviation safety researcher explaining how rules are set across airlines. When carry-on items overflow overhead bins, departures can be delayed as crews either stow extra bags or send them to the hold. On February 2, 2026, Virgin Australia updated its domestic carry-on policy: economy passengers can bring one standard-sized cabin bag up to 8 kg for the overhead locker, plus one small personal item for under the seat. The article also notes similar tightening abroad, including Air Canada limiting basic-fare passengers to one personal item on certain North and Central America routes. Differences persist because total aircraft weight limits, including fuel, supplies, crew, passengers, and baggage, must remain within maximum takeoff weight, and average passenger weights and carry-on assumptions vary by aircraft size and airline requests. It references regulated assumptions such as 77 kg historically in Australia (excluding carry-on) and a current standard adult weight model for larger aircraft.