I'm looking for a story that's told in the second-person - "You are doing this" etc. At first it seems mundane, but then it us revealed that all the characters, including you, are wearing backpacks filled with dynamite, everywhere you go, burdening you with discomfort as well as with the risk of death at any time. It's an obvious nuclear proliferation metaphor and quite short. I read this in some sort of a book - an anthology or possibly a mostly non-fiction book with some flash fiction fables. It's rather like Varley's Manhattan Phonebook (abridged) or Douglas Hofstadter's Tale of Happiton
As I think of it, I believe the story starts as if it will be a retelling of the Sword of Damocles