Hi all! I have two questions for you guys. 1. I have a 2015 MB Pro model with the 256 SSD. I just started graduate school, and will need to transport my computer to and from work to school, etc. I purchased one of those backpacks that has a section for your computer in the rear of it, and then your books, etc in the front of it. I know with the older computers with hard drives you would want to shut it down, however, with the new SSD should I shut down or can I just sleep it? If I do sleep it, will that create too much heat (may sit for hours in the bag). I would appreciate all help/advice. 2. Do any of you use a keyboard cover? My keyboard is starting to get dirty. I bought some wipes to clean it, but was thinking about maybe investing in a cover to protect the keyboard. Has anyone tried one? If so, what did you think? I am not sure if it would be to "rubberish." Thanks all!