My wife just got a MacBook Air and she is looking for a way to carry it around. She has a bag that fits it nicely but the bag is not water proof and has no padding. She would like a sleeve of some sort that can help protect it and keep the water out when necessary. There seem to be a lot of those but she would also like to have a detachable strap and none of the sleeves that we can find have one. Does anyone out there have any recommendations? What do you recommend for a teacher with one of the new Macbook Airs who needs to be able to transport it back and forth?