Put it in a cake box and wrap the cake box several (atleast 3) times with plastic wrap. When they are ready to eat it, they take it out, let it thaw with the pastic wrap on it, then eat. 
Well, the best way is to freeze it solid and then use one of those vacume sealers (like the food saver) but if you don't know anyone who has one of those, freeze it solid, then wrap it in saran (2 or 3 times) and then in put it in one of those cheep tuperware type containers.
I tell all of my brides to box the top. Then wrap the box completely in saran wrap then in tin foil. Then freeze. When it's time to thaw, bring to room temp still wrapped, then open and enjoy... believe it or not some actually think it's still yummy!
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