Here’s an article of Sebastian Kuepers, who got rid of most of this physical belongings and down to a 100 items. Unfortunately he doesn’t list these things and also doesn’t explain the way he counts. The definition of a „thing“ is missing. In the comments he explains that one pair of socks counts as one thing – this makes perfect sense to me, but I wonder how he handles less obvious cases. Take this camera:
How many „things“ do you count? One thing called „camera and accessories“ or eight items? Neither makes much sense. Just the camera body without a battery or SD card is plain useless so these three things could easily be counted as one, but you wouldn’t need the spare battery / SD card to make the camera work.