Should I get a macbook air even if I already have a macbook pro?

I currently have a macbook pro and i really love it, it's perfect for all the creative work I do with video editing ad music, but I'm starting law school next year and I'm told I have to bring a laptop to every class. As great as the pro is, it tends to be kind of heavy when i carry lots of books. I'm thinking of getting a macbook air 11" for typing notes and doing some legal writing on the go, and using the pro more as a desktop. Is this a good idea?

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