A (nearly) perfect bag for my 13 "MacBook Air

The two additional subjects are very handy when it can choose two opening options:
in a horizontal position of Velcro, a zipper in a vertical position.

Minor points:
I do not have to accommodate a couple of A4 pages still a small subdivision in the main compartment;
a small compartment for pens would also be practical;
Although the followers of metal zippers look good, but can scratch delicate surfaces table.