On JetBlue your first checked bag flies for free. Each checked bag must not
exceed 62" (157.5cm) in overall dimensions (ie. length + width + height) and
must not exceed 50 pounds (22.73 kilos). Note that boxes will not be
accepted as checked baggage on international flights.
JetBlue | First bag free
www.jetblue.com/flying-on-jetblue/first-bag-free/JetBlue