I'll add.
I am a Packaging Engineer (mostly pharma/healthcare products). Without going into too many details, some of my responsibilities include: finding solutions to make sure things get safely from A to B (e.g. you actually get a bottle of tablets instead of a bottle of powder) & ensuring packages are child resistant (but still easy enough to open that my Mom won't complain).
BTW--One of the things that I've enjoyed most about marching in DCA is finding the variety of careers folks have. I've marched with teachers, students, police officers, lawyers, pilots, salespeople, nurses, postal workers, social workers, info tech specialists, real estate agents, travel agents...all of whom I would not have met through any other activity.