Broadly speaking, anything you take into the airplane cabin with you are considered carry-on items; however, your airline may allow passengers to bring a smaller bag on the plane with them in addition to their larger carry-on bag. One important exception might be if you are flying with a basic economy fare that may allow ONLY a personal item and no access to overhead compartment space for carry-on luggage or another, larger bag like a duffel bag. This smaller item is often referred to as a “personal item” since it is typically a purse, briefcase, laptop bag, small tote or something similar. A personal item is ideal for carrying things you want to keep with you at your seat. Personal items are generally stored under the seat in front of you, which requires that they be a smaller size than your typical carry-on. The size of bag that is allowable as a personal item will vary from airline to airline. It is essential that you check the carry-on policies for every carrier on your itinerary so that you don’t run into any issues. Please note that airlines often allow passengers to bring on extras (in addition to a carry-on and/or personal item) like jackets, reading material, items purchased in the airport, etc.