Mylar bags provide a convenient, easy, and cost-efficient way to stockpile food for an emergency situation, or for a period of rainy-day personal adversity. Though Mylar bags are a high-tech NASA inspired technology, they are simple to use and an ideal do-it-yourself packaging method. This article provides step-by-step guidance to make the project easy, even for a novice. The process outlined here can be used to increase the shelf-life of dry foods, and also for the safe-storage of gear and emergency supplies. This is Part-4 in a four article series on emergency food storage.