While the most familiar egg package is the pulp or foam carton holding one dozen eggs, eggs are now being packed in more different package sizes than ever before. In some regions, cartons or other packs of 6, 8, 12, 18, 30, 36 or 60 eggs are available, making it easy to buy eggs for households of almost any size. To maintain quality, buy only as many eggs as you will use within three to four weeks. Whether made of pulp, foam or clear plastic, the carton insulates the eggs from jolts. New package designs are constantly being tested to provide the best protection for the eggs. The carton also prevents loss of moisture and carbon dioxide from the eggs and keeps the eggs from picking up undesirable odors and flavors. Because temperatures fluctuate more on the refrigerator door and slamming can cause breakage, it’s best to store eggs in their carton on a middle or lower inside shelf. Packing machines place eggs in their cartons large end up to keep the air cells in place and the yolks centered. The carton shows brand, grade, egg size and nutrient content.