If you need to check a bag, Spirit's bag policy is pretty straightforward: you can check a bag that's up to 40 pounds and 62 linear inches (that's length + width + height). But here's the thing: you'll need to pay for it, and the cost varies depending on when you book and the route you're taking. It's always a good idea to check the website for the most up-to-date pricing.
Now, you might be wondering what happens if your bag is overweight or oversized. Well, Spirit's got you covered (or should we say, they've got your bag covered!). You can pay an extra fee to check a bag that's up to 50 pounds or 80 linear inches, but be warned: it's not cheap. And if your bag is really, really big, you might need to ship it separately.