Checked bags: Maximum of 62 linear inches (length + width + height; 158 cm) including handles and wheels and maximum of 40 pounds in weight (18.1 kg). Any bag that exceeds these dimensions or weight limit is considered oversized/overweight and has a corresponding charge.

Yes, Spirit Airlines is notorious for strictly enforcing its baggage dimensions to maintain its ultra-low-cost model. Gate agents frequently use "sizer boxes" to verify that your personal item fits the 18 x 14 x 8 inch limit. If a bag does not slide in easily, it is often up-charged on the spot, with gate fees reaching up to $65 or more. For checked luggage, Spirit adheres to a maximum of 62 linear inches and a weight limit that is typically 40 or 50 pounds depending on the fare class (Spirit recently increased the standard limit to 50 lbs for some tickets in 2024/2025, but you must check your specific booking). Oversized or overweight bags incur heavy surcharges. To avoid these "hidden" costs, travelers are advised to measure their bags—including wheels and handles—before leaving for the airport, as Spirit’s revenue relies heavily on these ancillary fees.