I have been using my new air 11" for a week and I brought it with me when i were outside to many places. I put my Air into a sleeve case (Snugg) and put into my back pack. I have seen some using the hard shell case (for example from Incipit feather case). I like it's so sleek! So i have an idea that it would be convenient if i just put the Air hardshell case so I can put it directly into my bag pack. As I did some research, here and there, I saw many mentioned the issue about the heat and easy-to-crack (when u remove or insert). What do you guys think? Is it better than putting in a sleeve? and is it matter a lot for the heat problem putting it in the hardshell case? Any good case that you could recommend ? Thank you and wish you all a Happy new year!