I am a single mom heading to WDW with two 4 year olds. I know I can gate check my stroller, but does it need to be in a bag? I don't have one and don't plan to travel with the stroller much so I really don't want to spend more money unless everyone thinks it is really necessary. Also, my girls are big enough to use booster seats. Can I take them on the plane and put them in the overhead bin? They are evenflo amp no back boosters. So basically a seat with arms. From what I read, it doesn't sound like I can use them since they have- not for use with lap belt- printed on them. IF I decide to check them at the ticket counter(flying air tran), do I need to bring a bag? Can a regular duffle bag be used? I don't have a special bag for them. I was just concerned that it would look too much like regular luggage and they would want to charge me.