I’ve been using a sleeve that I bought for my 11" MacBook Air in 2011 (and for it’s 2015 replacement). I not have a new 13" MacBook Air and it doesn’t quite fit in the old sleeve.
I think the old sleeve is labeled “Cobac Sac”, though it’s hard to read. It’s got burlap on the outside and fleece on the inside. I can’t find any mention of it on Google.
Does anyone make something like it today that would fit the new Air?