I put my 13" MacBook Pro inside an Incase Neoprene sleeve which I put inside my Incase messenger bag with papers and such. I am generally a skinny person.. so the bag generally is behind me when I walk rather than to the side or at my hip. The problem is... I noticed some wear along the edges and it's getting worst. I checked the incase sleeve (which the inside is white) and I noticed gray smudging along the lining. It's somehow getting worn away. I just walk around... my bag bounces around my side... Hasn't been dropped. I don't really leave the apartment maybe twice or three times a week with it. Has anyone else experienced this??? Any suggestions on how to carry around a MBP???