Travelers are being advised to adopt packing methods to avoid overpacking their carry-on luggage, with some experts suggesting specific techniques such as the "5, 4, 3, 2, 1" method or the "333 method". These methods aim to help travelers pack efficiently and effectively, potentially in response to airlines tightening their rules. Various outlets are offering tips and tricks for packing lightly, including advice on what to include and what to leave out of carry-on bags for different types of trips.