Just the package, as far as I know (though obviously as you can see in this thread I can be wrong!).
But some people buy the vouchers on ebay, and here on this forum there's a long thread of kind people realizing they won't use, or coming back wihtout having used, them and sending them to the next person on the list. Even though the list shows the dates of travel, it's solely done in the order that people sign up for the list.