Rectangle glass containers with airtight 4-sided lid-locking system preserve freshness of foods. Durable tempered glass with airtight 4-sided locking system keeps out air and moisture, preserving freshness, flavor and crispness of foods&149; Freezable and microwavable to reheat food&149; BPA-free plastic lids with silicone seals create watertight storage to preserve liquids&149; Clear glass is attractive on the table serving dips, sauces vegetables or salads&149; Ideal range of sizes for everyday storage&149; Nontoxic and nonreactive to liquids or foods&149; Stackable to store