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.