Sak and a good bright led torch. After that it's meds and some cash. You never know when a card machine or atm is out of order.
I rarely go out of town, where everything is in walking distance, but when I do, I have a space blanket, cheap plastic poncho , water bottle and brew kit, even if I'm only going 20 miles to the next town. I've been stranded for hours more than once when buses, ( which are my primary transport ) have broken down, or not turned up.