The feature is that it can be sealed to match the shape of the food for airtight freezing. It allows for sealing and freezing to fit the shape of items like bumpy broccoli. Tupperware - no longer sold. This innovative product shuts out air and freezes food in a short amount of time, preventing freezer burn, frost, dryness, and oxidation, thus preserving the appearance and flavor of the food when thawed. The seals are made of silicone resin and fit the food snugly. They can be put directly into the microwave for thawing, so you can easily handle everything from freezing to thawing and reheating in a single container. - Brand: Tupperware - Colors: Orange, Blue - Size: Large approx. Length 23cm x Width 16cm x Height 6.5cm Small approx. Length 23cm x Width 16cm x Height 5cm Capacity: Large 1.3 liters Small 800 milliliters - Material: Plastic - Usage: Food storage container This is a used item. Please refrain from purchasing if you are concerned about small scratches or stains. Tupperware Storage container Food storage container Tupperware