Quite a lot tbh.
- Water bottle to stay hydrated
- Nail clippers because if I don't carry them I pick my hangnails and my fingers would be perpetually bleeding lol
- Lip balm cause I get dry lips
- Moisturiser cause I get dry hands
- Tissues
- A multi-tool
- USB-C charger
- Wallet
- Keys
- Antibac wipes
- Hand sanitiser too lol
- Watch
- Lighter
Obviously it's a long list but these are small objects so it's not really a lot when you're carrying a bag.
I usually don't carry a phone or anything like that if I don't need it where I'm going; normally I can avoid it. But if I need a phone, laptop, etc where I'm going then I'll have that on me too.