Spirit Airlines Checked Baggage Policy aims to deliver ultra-low fares by charging only for services you use. Checked bags must be under 40 lbs and 62 linear inches. Travelers pay less if bags are added early, either during booking or via Spirit’s online portal. Overweight or oversized items cost more. The airline permits multiple bags, but capacity can be limited, especially on full flights. Planning ahead is key. Spirit’s mobile app helps manage baggage payments and check-in. Know your route’s baggage fees in advance using their online calculator. Smart planning ensures stress-free travel and fewer surprises at the airport.