We have a backpack that everyone uses, and which we try to keep in order. We rarely leave the house without it, unless it's for taking a walk or posting a letter or something like that. But we also have a large number of small "emergency packs" containing anything from the usual writing utensils to shiny mirrory things or miniature books, and even a battery-powered metronome (against the once-frequent loss of an inner sense of time/pacing/rhythm in overwhelming environments; it had headphones so no-one else heard it)! It may be fun to go through them, although I don't know how many there are and I'm a little afraid of what we might find...