Hi all, I recently ordered an 11" air with the great 20% amazon discount. While I wait for it to come I am wondering whether or not to purchase a sleeve or case. For my current laptop (17" mbp 2009) I do not use a sleeve, I just put it straight into my backpack. I have never had any issues with this. It seems with the ssd, the air would be even more durable than the mbp, so is there any reason to use a sleeve? Thanks!