I have purchased multiple sizes of these Rubbermaid Premier storage container because they are the BEST I have ever used. They do NOT stain and can go from the freezer to the microwave. They also do not hold any food odors once washed. I NEVER put the lids in the dishwasher and they have remained air tight, but flexible. Because the lid gaskets are flexible and have ample lid edges, they are easy to seal or remove and do not break fingernails. These are the only containers I have ever used that you can store a green / spinach salad in and the salad stays perfectly crisp for several days in the fridge. When freezing food in them, they completely protect the food from freezer burn. I also like the fact that they are crystal clear other than the sealing gaskets. This allows for locating what you are storing at a glance. They are also stackable and nest within each other when not in use for efficient storage requiring minimum space. This particular size is very small and has its own uses such as spice mixtures used in marinades, or easily fits in a lunchbox.