Perfect for dressing, condiments, spices, leftovers, babyy food and more. Easy to close: Simply press outer top to easily an securely lock lid. Leakproof: Multiple innner locking tabls ceate an airtight, watertight seal. Durable, BPA free Tritan material resists warping, staining and odors. Modular stacking for refrigerator and freezer organization.