Match the bag to the machine: a 13-inch laptop needs about 31cm
of internal width, a 15-inch about 36cm, and a 16-inch slightly
more, so always check the stated capacity, including your laptop's
own model. Aspinal lists laptop capacity on every product page; the
Mount Street Laptop Briefcase, for instance, takes a 15-inch laptop
or 15.5-inch MacBook Pro.
