Made Sustained Round lunchboxes have a BPA-free silicon leak-proof lid. That makes it handy for wet lunches or salads. The reusable lunch boxes are perfect for healthy lunches on-the-go when at work, at school, in the park or on the beach. The lunch boxes are made of stainless steel 304 (almost indestructible) and are available in three sizes. Small (150 ml), Medium (320ml) and Large (450ml). The lunch boxes are dishwasher safe and available in any size or as a set of three.