Made from robust borosilicate glass, these Kuhn Rikon boxes are perfect for use on the go and for storing food items. Complete with plastic lids, the boxes are airtight and watertight thanks to the 4-click closure. The vent in the lid means these boxes can be used in a microwave for quick lunches and the tough construction allows them to be stored in a freezer up to temperatures of -20°C for batch cooking. Though dishwasher safe, Kuhn Rikon recommend handwashing to preserve their durability. Square in shape, this set includes 0.3, 0.5 and 0.8 L boxes.