On Spirit Airlines, a "no carry-on" policy means that your base fare only includes one small personal item that must fit entirely under the seat in front of you (max 18 x 14 x 8 inches). Unlike traditional airlines, a standard "overhead" carry-on bag (like a small rolling suitcase) is not included and will incur a significant fee. In 2026, if you bring a bag to the gate that is intended for the overhead bin without pre-paying, you may be charged up to $65 to $100 on the spot. Spirit uses this "unbundled" pricing model to keep their base ticket prices as low as possible, allowing passengers to pay only for the services they use. To save money, Spirit passengers are encouraged to pay for their carry-on or checked baggage at the time of booking, as the price increases at check-in and reaches its peak at the gate. Essentially, if you see a "no carry-on" warning, it serves as a reminder that anything larger than a backpack or purse will cost extra, making it vital to measure your bags and factor in these fees when comparing Spirit's total price to other carriers.