Hey guys, I just got a new 2.66 GHz uMBP the other day and I wanted to get your input on whether or not a case was necessary or not. I plan on carrying around my computer in my Swiss Army backpack which already has a compartment for laptops. In your opinion, is a soft case necessary? Also, can anyone comment on the durability of the unibody design when compared to the previous generation MB's? I owned a 13" White MB for awhile and I kept it in pretty good condition for over a year in exception of a crack that developed at the edge of the casing. Thanks!