So Easy Storage Bags are freezer safe food storage bags with measurement marks to help parents understand portion sizes. So Easy Portion Storage bags are manufactured with biodegradable plastic. A 90day ASTM D5511 test on the bags showed 10% degradation in 60 days. The bags are perfect to use with stage 3 baby foods: soups, pastas, sauces and one dish meals. Features includes ounce and cup measure marks, bags stand upright in the freezer, there is a write on area, zipper seal and they are made with biodegradable. There are 50 bags per pack.