All survival situations should prioritize personal safety, shelter, warmth, water, then food. There is not enough room for shelter in a tin, but the others can be easily assembled. Navigation items like the compass to keep you from getting lost and a whistle to help you be found. Fire-starting materials for warmth. Then, the items you need for emergency water purification and storage. With hooks and cordage, you can gather food. The survival guide helps you improvise in many ways to help take care of your other needs.