In Basic or Economy class, there is no need to pay additional charges, if you carry two small bags. In Basic or Economy class, you can bring two small bags without incurring luggage costs. The carry-on luggage weight & size are subject to specific requirements. If your weight is less than 50 pounds, you may avoid the excess baggage fee. You will be responsible for the excess baggage fee, if carry more than two bags. If you bring any restricted or harmful items in your luggage, the airline may deny your boarding request. https://flightcancellationpolicy.com/a-guide-to-jetblue-baggage-policy