The leak-proof nesting trio is the perfect solution for packing yogurt, fruit salad, apple sauce, pasta salad, chips and hummus, apples and peanut butter, bagels and more! Also use them to store your leftovers in the fridge. And since they all nest perfectly inside one another they will take up very little space in your cupboard. Containers are made of #304 (18/8) food-grade stainless steel. Lids are made of non-toxic LDPE #4 plastic. Free of BPA, phthalates, PVC and lead!