The laptop is really good and helpful. Apple is a really good company and has very effective system. If you are looking for sleeve case you can find it here. The only problem with it is that its really expensive for people like me. I get a used one so it was okay for me. If I have a low budget I would go for some other branded.it is 30% cotton, 30% Nylon, 30% Lycra. check it out on.
https://focalprice.com/CS487P/13_MACBOOK_AIR_Laptop_Sleeve_Case_Pink.html. Hopefully this one helps