What happens if my carry-on is too large or heavy?
If you make the unfortunate discovery at check-in that your bag exceeds the size or weight limit of your airline, you will have to check it — which usually results in you being assessed an additional fee. To avoid this, measure the size and weight of your bag after it has been packed. If its weight is over the limit, consider shifting some of your items to other bags or even leaving some of your items at home.