Hi there.....we leave in 4 days!! YEAH...doing Universal a few days before we sail on 7/29 7 Day Western...haven't fully packed but looking like this: 2 Rolling Duffel Bags for our 2 boys (ages 11 & 6) 1 Large suitcase 2 medium suitcases..I think...might turn out to be 1 medium. 1 garment bag My husband will then be carrying on our camera bag and I will have a carry on bag. The boys are bringing their backpacks on the plane...can they be checked with the rest of our luggage..they won't need them on departure day? Any thoughts??