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I personally bought the 13" because I was looking forward to the school season and how much portability I need.

But using it over the summer, I wish I got the 15" for summer use because all I do is game in the summer with lots of intensive graphics work. But then again I realized how much of a pain it would be to lug around a 15" laptop during the school year no matter how light and thin that beauty is.

During the school year all I need is web browsing, text editing, and iTunes.
 
What bag did you buy to carry your 15" in?

i ended up buying a targus...has a soft terrycloth feeling liner with same lined outside pocket, shoulder strap, and 2 large accessory pockets...sounds big but its extremely thin
 
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