The Storage Essentials by Sage Spoonfuls includes storage jars, labels and stackable trays allow you to make your babyÕs food in large batches to save you both time and money! These 4oz polypropylene jars go from freezer to refrigerator to on-the-go making homemade baby food just as convenient, but healthier and tastier, than store bought. The jars are perfect for storing everything from pureed baby food to finger food snacks and can double as serving bowls when away from home. The product features include; Leak proof and have an air tight seal when closed to lock in freshness. The stackable tray holds 6 jars and lets you keep your fresh baby food organized. Trays can stack as high as your freezer will allow. The jars and trays are refrigerator, freezer and top rack dishwasher safe.