One key to packing light for business travel is to wear a suit for the flight out, assuming that suits are required dress for the trip. Two suits will suffice for up to an entire week if they are rotated every other day, and if one of them is worn only one other need be packed.
The best travel suits of course are those that resist wrinkling. There are two excellent choices for that task that I know of, the less common of them being mohair when such can be found (and not the 70% wool lightweight stuff either). Dormeuil's Tonik for example may have some sheen but it wears like iron. The same is true of the 15-16 ounce (435-465 gram) version of Minnis' Fresco. Both cloths wear cooler than their weight might suggest and are comfortable nine months of the year (for summer travel simply substitute lighter weight fresco, Finmeresco or another high twist cloth).
Wear the travel suit with a pair of dress slipon shoes and pack a second pair that should ideally also be slipons so that either pair will ease the process of passing through airport security. Add a dress shirt for each day plus one for an extra change, a couple of knit neckties and the usual accessories. Everything should fit in a hard sided carryon about the same size as the one in the illustration.
And that is my version of packing light for business.
You might also be interested in a new ASW post on bespoke shoes now online at Forbes Lifestyle.