Millennial snowflake reporting in.
My work bag is a leather satchel. Mainly because a rucksack over a suit or blazer (and overcoat at this time of year) looks naff. Holds papers, pens, planner, tech, lunch etc.
More casually, my ‘EDC’ is a few keys, a keyring torch, a small wallet and a phone - so pockets are perfectly sufficient. No need for penknives. I keep a few tools and useful bits in the car.
If I need to carry more, I have rucksacks for that. One shoulder if just a short walk. Both if actually walking. I don’t see a need for one of those sling bags that I think this thread’s referring to… but to each their own.
I also keep an ‘emergency bag’ in the car. I’ve only had to use it once - there was a whiteout several years ago and I had to walk 12 miles home as the snow and ice was too much for a) my car (and tyres), and b) my skill as a driver at the time.