Which of the following is NOT an acceptable form of luggage for carry-on?

The identification of an oversized suitcase as not an acceptable form of luggage for carry-on is accurate because carry-on baggage is subject to specific size and weight restrictions set by airlines. Generally, airlines define carry-on items with maximum dimensions that allow for safe storage in the overhead compartments or under the seat in front of you. An oversized suitcase typically exceeds these dimensions, making it unsuitable for carry-on purposes.

On the other hand, options such as a carry-on bag, personal items, and a personal backpack fit within standard airline guidelines for dimensions and weight, and they are commonly accepted by airlines for carry-on luggage. These items are designed to be manageable and comply with the restrictions that facilitate boarding, deplaning, and in-flight storage without obstructing passageways or overhead spaces. Understanding these guidelines helps ensure a smoother travel experience and adherence to airline policies.