One complimentary under-seat item is yours when you fly with Sun Country. Prices vary based on when you make your payment if you need to bring more luggage. When making a reservation, if you choose the option, you are allowed to bring a carry-on together with your first checked bag for or less. You will be charged for your second and third piece of checked baggage at the time of booking. knoe more about sun country : https://travobravo.com/sun-country-airlines/does-sun-country-charge-for-carry-on/