13 (14 is fine too). It is super portable, can even fit in a purse or backpack without weighing it down, if I want a big screen I hook up to a monitor. With 13

13 (14 is fine too). It is super portable, can even fit in a purse or backpack without weighing it down, if I want a big screen I hook up to a monitor. With 13 I can easily sit on the couch and read an ebook and almost feel like it is a real book since I can position the computer easily. With macbook air the battery also last super long.