People are trying to overpack their carry-on bags to avoid checked-baggage fees, though the airlines strongly dispute this.

人们试图随身多带行李以免除托运，空公司强烈反对这种做法。

Another factor may be that more people are trying to overpack their carry-on bags to avoid checked-baggage fees, though the airlines strongly dispute this.

另外一个因素可来多的人为了不交行李托运而尽量随身携带更多东西，尽管空公司强烈反对这种说法。