What is the Difference between a Steelbook and a Metalpak?

[Maggard]

What type of case is being used for PS-Vita Collector Cases? I have yet been lucky enough to pick up one, so do not have an example.
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My first SteelCase was a lucky but a GameStop, priced same as the normal PS3 which I believe was $7.99.
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I wish I had the funds to pick up PS3 & PS-Vita games in SteelCase versions whenever offered. Tried to import a couple when money was better.
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Life's Too Short Not To Game!!!