Got a question about coolers. Now I KNOW that Disney says no coolers. However, I've read about "collaspable" ones allowed. Please tell me more about these.....how big are they? Are they the same thing as what DH takes his lunch to work in? If not, where would I find one? Are we allowed to bring "beverages" on to the ship for sure? If so, are they in suitcases or in these "coolers". Also, if we wanted to pack snacks to take on an excursion, are we allowed on and off the ship with the "cooler". Please help! I need specifics!