Not on a spectrum I believe, but I can't leave my house without a backpack holding:
- A universal charger with a splitting cord for all popular connectors, a powerbank.
- Two pocket knives and one or two boxcutters\scalpels with exchangeable blades.
- 0.5-1L of water.
- Usual medications against head, stomack pain.
- Snacks and a fork\spoon.
- A book for leisure, a e-ink book and a notebook.
- A black marker and various pens.
- A rope I can use to carry multiple things.
- Carabins for the same reason.
- More usual options like plastic bags.
- Spare lighters and a flashlight.
- A copy of my ID to access services.
- Headphones and reflective glasses to turn off the surroundings when I need it.
Surprisingly, all of them came up handy in different contexts. Guess, just walking with all these things is a little training.