You are allowed one carry-on in addition to one personal item such as a laptop computer, purse, small backpack, briefcase, or camera case. Remove all lighters, knives, scissors, and blades of any type or size from your carry-on baggage. To know how to pack items in your carry-on and checked luggage, please visit Packing Tips. It is preferred that you check your luggage. Carry-on space is limited, particularly during the holidays, and airlines are cracking down on the size of those carry-ons. Also, considerable carry-on luggage slows down the screening process. Check your airline’s website for luggage requirements.
Remember 3-1-1 when packing your carry-on bag:

If any items in your carry-on luggage are confiscated by the TSA, do not bring those items back to the airline ticket counter as your luggage has already been processed. A mail service is provided at Sarah’s Ice Cream and Cookies.