I'll get to my bag in a minute, but when out walking my mate just started a conversation about a BOB. I've not told him I'm a bit of a prepper, and he has never mentioned anything before. The conversation skimmed over things about prepping. Not sure if we were both testing the water to see how much we each actually did.
I will however bring the conversation up again on our next hike out.
Anyhow, as has been said above, I always have a 'just in case' bag.
It's a 5.11 grab bag (upgraded from an army MTP ammo/grab bag but the same thing really) and in it I keep a bit of cash, some food & water, a torch, some light sticks, a small knife and a rescue knife (belt/rope cutter etc) fire making stuff paracetamol, asprin and ibuprofen and also a resonable first aid kit. I also have a hip flask
I guess it is just my handbag really