Notebook Laptop Case

What size clip on laptop case should I get for the apple notebook?

So I am shopping online for a clip on case and I know how to measure the laptop and stuff, but on the computer, when it says 13.3 inches, is it talking about the screen or the whole laptop. Like my screen is 13.3, but the whole laptop when the top is closed is 15 inches. Which clip on size should I get?
I just got it in the mail but it doesnt fit on my laptop.....I think I got the pro case instead of the notebook....does anyone know how i can return it to amazon if the seller was IVEA ELECTRONICS?

If your laptop is considered a "13.3 inch MacBook", then that is the measurement of your screen horizontally across it. Chances are, the clips you're looking at are marketed to the size of your screen, not the actual dimensions of your laptop. Hope that helps.

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