In many countries, backpacks are heavily identified with students, and are a primary means of transporting educational materials to and from school. In this context they are sometimes known as bookbags or schoolbags.
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The key difference between a bookbag and a backpack is the way in which we carry them. Bookbags are traditionally used by primary school age children and carried by two handles, much like a handbag.A backpack however is carried on the back. Although they are different, the two terms are still used synonymously.
In most cases, backpacks are considered personal items as long as they fit under the seat in front of you. For example, if you use a backpack as a personal item and put it under the seat in front of you, you can then use a duffel as a carry-on bag as long as it's under the airline's size requirements.