With its built-in rubberized seal and four locking tabs Lock-its provides an extra secure lid for your food storage needs. Lock-its will also stay organized with the Easy Find Lids system: Lids snap to bases and other lids. You will never lose a lid again! One lid fits multiple bases and the various sizes nest for compact storage. Lock-its are safe to use in the microwave, freezer, and dishwasher and are available in ten sizes.