Spirit Airlines Charge for Bags
If you are traveling with Spirit then you have to be permitted to travel free with your things that fit in smaller size bags (purse) its fee is always included in your ticket. But if you have other big things or objects and you need to carry them in a large size bag, then it is surely to pay a fee for that. You can only bring your things for free like- an umbrella, camera, infant diaper and other outer garments, food for flight, and reading materials.
Neck and head pillows can only be carried on the aircraft if they fit completely in your carrier bag.
https://petbaggagepolicy.com/