I will second that on the MacBook Air. I take mine all over the world with me, and out into the field. My 2010 MacBook Air 13" has been beaten up like you wou

I will second that on the MacBook Air. I take mine all over the world with me, and out into the field. My 2010 MacBook Air 13" has been beaten up like you wouldn't believe - I've dropped it (twice ) from a height of 5' onto concrete, onto it's corner - it bent quite a bit, but still performs flawlessly. It's with me in my backpack 100% of the time, and is treated very, very roughly. The only downside of the MBAir is how slippery it is (which is why it came out of my unzipped backpack). My Dell Latitude 510 (and then 620) - both never made it past year 2 before suffering structural failure.