I don't think this has been covered, although we have bag threads, strap and handgrip threads, accessory threads, hood threads (pun unintended), lens cap threads, and others..... I'm not asking about bodies or lenses either.
What's in your walkaround kit or bag? (I'm also not referring to your main travel bag or whatever, which probably has charger(s), cables, computer, backup stuff, spare lens cap and body cap, full cleaning kit etc- Thorsten Overgaard's excellent full travel kit is here.)
My walkaround kit is:
EVF
spare SD card
microfibre cloth
Whibal card
circular polariser
plastic shower cap for emergency protection (camera, not head)
slip of paper with name/address/phone number/email address
hat (can double as lens shade)
(intangible) insurance
In my (day) rucksack (mostly for landscapes):
spare (charged) battery
tripod
cable release
more cleaning stuff, though not often used
variable ND filter
macro adaptor
proper dry bag for dire rain events and river crossings
(jaapv's suggestion) a small/obsolete SD card with the latest firmware.
something like a nylon bag with drawstring (which can be filled with rocks) which can be hung under the centre of the tripod to stabilise it
Anything else?
John.