Our Mini-Dippers are designed to fit inside any lunch box. You can even freeze home-made baby food portions in these handy containers. Also useful as little storage containers for craft items like beads or small hardware. They are made of polypropylene. NO BPA or phthalates. Sturdy and reusable, safe for microwave, fridge, freezer, and dishwasher. When not in use, they nest to save space.