I was curious as to what size limits there are on carry on bags. We are going to be getting in way before check-in time, and probably be heading towards DTD and maybe some miniature golf. I was thinking about just putting what we might need until our luggage gets there in a book bag and just carrying that around with me. This also leads me to another question, do the shops and restaurants have a problem with people coming in and out with book bags?? I work retail at a much much smaller scale then Disney and we always make people leave book bags at the front counter, didn't know if this is also practiced there as well. Just basically trying to get some feedback or ideas as to what you guys use for carry on bags.