04. No Snack Boxes
Many people bring their own snack boxes when flying. This approach is not good at all especially in domestic or medium haul flights. Because in these flights, the weight of your carryon belongings is highly limited and the snack box will limit it further down. If you have to eat in flight, resist the temptation to get the snack box. That thing is only going to weigh you down! Otherwise you might have to pay extra for luggage at the airline counters.