I booked the cheap flight from OAK to EWR (both way) with spirit airlines. You cannot have either a personal luggage. This information is not there so the comparison I made with all other tickets was not that true. So far my fault. I am not satisfied by the fact that they did the online check-in for the first trip without any bag, and for the second trip they did nothing and O could not find where I could do it. I had to add baggage at the airport that costs more.