I would take an extra sheet with you just in case, and not in white so you don't get it confused with Disney's. We have not used a Pack and Play @ WDW, but did numerous other times and resorts. Often the pack and play was overlooked for linen changes, and it was difficult to obtain extra sheets off times (when most of housekeeping is gone @ 3am and your child soaks the sheets). Just a thought. We had an extra with us for those times!