I’ve got wallet and lighter front right, phone and cigs front left, and keys on a carabiner tucked into back right. Back left is basically always empty.
Car-centric infrastructure, baybee! Better have those credentials or you might get shot or imprisoned! Or both!
In the Netherlands, there’s no duty to carry ID with you everywhere you go, but if you happen to be asked to show ID by someone with the authority, you have to, so it’s sort of mandatory in practice because you never know what’ll happen.