You just need to be more careful, I know its sounds stupid and sort of condescending but when I have stuff in my hands thats expensive I walk on egg shells practically. I know people who seam to break everything, you don't seam like that as you actually know it was a bad thing to do. As for scratch's, eventually they will happen, you'd think the metal was resiliant and it is but eventually my old MBP's metal lid was scratched quite a bit from being put in and out of my backpack so many times, the scratches were never deep though, a pouch for it solved this problem but I found the pouch to be making it too thick...same with a case. When I put it in my backpack I made sure that it was placed in a way that heavy books wouldn't press on the lid in a way that might damage the screen, as well as other measures.