Innovative, practical and stylish - plus airtight and 100% plastic free. Frank Green Porcelain Bowls 2 Pack (700 & 1500 ml) - Blushed can be used to cook, store, freeze, heat, serve & eat all from the same beautifully designed bowls. When you've finished your meal, add the lid, push down the 'smart vent' to create an airtight seal, and pop your leftovers in the fridge.