Interlocking lids-simply press down on the center button to lock lids together. Tight lid seals in freshness. Microwave, freezer and dishwasher safe. Easy to store. Conquer cabinet clutter with these containers, as interlocking lids keep same-shaped lids stacked neatly in one place. Simply press down on the center button to lock lids together. Extra-sturdy with a tight seal to seal in freshness. Microwave, freezer and dishwasher safe. Easy to store.