Spirit Airlines is known for its low base fares and à la carte pricing model, where travelers pay extra for various services and amenities. Understanding Spirit Airlines' Baggage Rules is crucial for passengers to avoid unexpected fees and ensure a smooth travel experience. Spirit Airlines allows one free personal item per passenger, which must fit under the seat and not exceed 18 x 14 x 8 inches. Carry-on bags incur additional fees and must be within 22 x 18 x 10 inches. Checked baggage also requires a fee, with a maximum of five bags per passenger, each not exceeding 62 linear inches and 40 pounds.