I have been the worst customer! First I ordered a sleeve for my 11 in MBA in vertical orientation and later decided I wanted it in horizontal. After contacting them via email the were more than happy to change the order. Then today I decided to exchange my 11 in MBA for the 13 in model and once again contacted SF Bags to amend my order to a 13 in sleeve vs the 11. They graciously changed the order and will ship out later this week. They are very busy with many orders and yet have been plenty willing to help me out. Thanks Gary!