The metric system is bogus "progress". All converting did was chase our industries out of our own markets.
Take for example the automobile industry. Today, engine displacement is usually measured in liters, not cubic inches as in the past. That's why the 302 cubic inch displacement V-8 engines are labelled 5.7-liter engines at least since the middle 1980's. Indeed, most four- and six-cylinder engine displacement is measured in liters or cubic centimeters at least since the 1970's. Also, auto mechanics have to use metric tools given the large number of Japanese and German-designed cars now in the USA. You try using a English-measurement wrench and socket set service a Honda car!
Of course, the food industry has also heavily invested in measuring by metric measurements--all food package labels have both English and metric measurements, and soft drink bottles in one and two-liter sizes have been around since the middle 1970's.