Yep.

I get to (have to) work from home as well as at work. This means, at minimum, a laptop and some files, as well as a charger for 8+ hour days. Earlier in my career, I frequently transported a number of books, though at this point I've mostly obtained duplicates or electronic copies of almost everything. Books still happen sometimes and they are not small. I don't even eat lunch, but if I did like normal people, that would be extra.

Add in gear for possible weather shifts to rain/snow and that stop for a gallon of milk (or more frequently, some vegetables and toilet paper), and the enormous waterproof messenger bag is looking pretty good!