Emergency ration bars typically last for up to 5 years when stored in a cool, dry place. The shelf life of the bars depends on the ingredients used and how they are packaged. Most emergency ration bars contain dried fruits, nuts, grains, and other nutritious ingredients that have been dehydrated or freeze-dried to extend their shelf life. Properly stored emergency ration bars can provide an important source of nutrition during an emergency situation when food is scarce.