The 300cc Oxygen Absorbers Mylar Food Storage Bags are a set of 50 white storage bags made from a combination of Mylar and aluminum materials. These bags are specifically designed to preserve food by absorbing oxygen and keeping the food fresh for longer periods. The size of each bag is 300cc, making them ideal for storing a variety of food items in the kitchen. With their oxygen absorbers, these bags provide a convenient and efficient way to store food and extend its shelf life.