> So that makes it half the size of a pack of cigarettes?

Kinda. It is about 25% wider than a pack of (American) regular cigarettes, and a bit shorter, and roughly as thick. And it looks smaller because of all the rounded parts.

The best analogy I could come up with is that it is about as wide and tall as a dollar bill folded in half (or half a 100 Euro note for you Old World people).

Again, let me reiterate; until Rob says otherwise I am just making guesses here.