Canada’s Globe and Mail interviews a “globetrotter museum planner”:
You must have packing down to a science.
I do. And by the way, there’s no such thing as perfect luggage, only a perfect packer. I travel with just a carry-on, whether I’m going for three days, three weeks, or three months. The essence of packing carry-on is that you have to be willing to give up freedom of choice. The clothing you take should be pre-planned. I rehearse every minute of every trip before I go, and the packing follows. Every trip has a colour scheme. - more here
(Thanks to OBOWer Maria for the heads-up)