Store, heat and freeze meals, produce and ingredients with Bentgo's Signature food storage system. Oven-safe glass containers give you a clear view of contents, while the silicone-sealed tempered glass lids are airtight and leakproof. The lid's built-in steam valve allows proper venting and splatter-free heating for warming up foods in the microwave. The 10-piece set comprises two 1.6-cup and one 4.1-cup lidded round containers, and one 2.7-cup and one 6.3-cup lidded rectangular containers.