[Haskell-cafe] Non Empty List?

Hi, I need to design a container data structure that by design cannot be empty and can hold n elements. Something like a non-empty list. I started with: data Container a = Single a | Many a [a] but the problem above is that the data structure would allow to construct a Many 5 [] :: Container Int. I can't figure out how to get this right. :( Please help. Günther