I imagine that Apple's intention for the 12" MacBook is for people to be able to carry them around and do things just about everywhere, hence making it thin and light. I'm currently saving up and waiting for the next iteration of the MacBook. However, one concern I have, and would like to ask current users about, has to do with keyboard marks and/or grease on the screen. The MacBook and the MacBook Pro models all appear to have one continuous glass screen, and there also appears to be next to no gap between the keyboard and the screen when the MacBook is shut. In the past, I have had to deal with grease and even scratches made by the keyboard on the screen after carrying a laptop around in a backpack wherever I went. I've also dealt with this with my MBA, but I've been able to tackle this issue with a thin fiber keyboard cover that I would place on the keyboard before shutting the lid. However, the MBA's screen is a little recessed, so there's some space in there. It also doesn't help that I carry it (sleeved in a semi-hard Booq Vyper sleeve) in a somewhat small backpack that also has an iPad and a couple books in it, so I wouldn't be surprised if the iPad and books pushed against the screen while I'm in transit. I've also run home while carrying all that in the past. So, to those of you who regularly carry your MacBook around to places, how has the screen fared? Do you recommend a keyboard cover, a screen protector, or an outright dedicated laptop bag suited for the MacBook? Or is the screen resilient enough as it stands? I'd like to refrain from getting another bag if possible since I enjoy run-commuting.