If you want something just so, then it is worth going bespoke; that's what the Bagaboo Macbook Sleeve is all about. Yes, you could buy a standard neoprene sleeve and it would work all right, but it wouldn't look as cool, last as long or perform as well as something like this case.
I had the case made in the same colours as my Workhorse Messenger Bag (Link), it's also the same ultra durable Cordura outer material, which is water resistant and stain resistant. It's padded on all six sides and it has a strong Velcro closure, so it's not going to suddenly open and let your laptop fall to the ground.
As is the trend with all the Bagaboo kit I've tested, it is superbly made. Because it is a custom case, it fits a 13" MacBook perfectly, and has enough room for a few sheets of A4 paper in the case as well. It's got a lovely feel and look about it, and I am sure it will last for years.
Another bombproof and ultra cool product from the Hungarian brand.
View the range of Bagaboo products at Bagaboo.hu (Link)