MacBook Pro - 17" vs. 15"

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[quote onthedownlow]-to add, I believe almost just as important (if not even more) is the actual method you transport the laptop and accessories (i.e. standard carrying case, backpack, sleeve, saddle-bag, etc.)
I have a bag like this, but the 12" version:
http://www.smalldog.com/product/46217

I typically also have my camera bag with me most of the time. It's a backpack.