These storage containers have every quality I was looking for in a food storage product. They are food safe ( BPA-Free); Stackable for saving storage space when not in use; Very secure snap on lids that do not leak; dishwasher, freezer, and microwave safe. With these containers, I can pre-prepare meals and refrigerate or freeze for use. I did not realize when I purchased this set how much I would use the 2 oz. containers. They are perfect for sauces, dips, and dressings to pack in a lunch box. I plan to order more and give as gifts. Very useful product.