I think those who don’t use bags are more popping somewhere for a short time, not going to the office for 8 hours.
for work days, I usually have - small purse, phone, keys, work pass, small pencil case (yes, I need more than one pen, this is a common thing for people who don’t have a regular desk to carry), notebook, tissues, kindle/book, water bottle, small pouch with plasters, paracetamol etc, another small pouch with sanitary towels, hand cream, hand sanitizer, lippy, lip salve, face powder, umbrella, reading glasses, snacks.
sometimes I also am organised enough to take a packed lunch. In the summer, remove the umbrella, add sun cream and shades (or as we live in Britain, keep the umbrella)
I have, however branched out into nice rucksacks for carting all my crap about. (Just as fashion magazines tell me that young people are embracing the tote bag again. )