I bought this as it was advertised as a 13.3 inch notebook sleeve, so I assumed my 13" Macbook would fit into it. It does, but it is a really tight fit. When you measure this sleeve, it is only 12", but it stretches. I seem to always manage to hurt my fingers whenever I get this cover on or off. It's nicely made, but smaller than it says. If you have a Macbook, think twice, it will work, but it is a bit of a tight squeeze to make it work.