Hi, I just got my first ever mac a MBP and i i want to know if i need a cover for it? my last laptop screen got scratched form the kets touching the screen and i was wondering if i should buy one of those cloth things that fits in-between the screen and keyboard? also the macbook pro came in a bag/cover thing from apple, should i be using this to cover my macbook pro? i transport it in a targus backpack