Answer a short questionnaire on region, climate, and household. The builder returns a 72-hour checklist you can actually carry — water, food, shelter, meds, light, and comms.
Bottom line: a 72-hour kit is a get-through-the-first-three-days bag, not a mall survival list.
Water, calories, a way to stay dry and warm, first aid, light, a radio or charged phone battery, copies of IDs, and any daily meds. Weight still follows the 20–25% rule if you have to walk.
It is the floor. After the kit exists, extend food and water at home to two weeks. The bag stays light; the pantry gets deeper.
Yes, sized to the person. Kids get a smaller bag with water, snacks, light, and a card with names and numbers. Adults carry the shared shelter and tools.
One at home you can grab, and a thinner get-home bag in the vehicle if you commute. Do not store the only kit in a basement that floods.