Quality: The lunchbox is crafted from high-quality borosilicate glass, with a lid made from safe PP and a seal crafted from food-grade silicone. The lid features a unique steam valve, is free from bisphenol A (BPA), and is leak-proof. When placed in the storage container, it can withstand temperatures ranging from -20°C to 400°C. Microwave/oven/dishwasher safe (excluding lids). Ideal kitchen storage jars: Lids feature a practical steam vent to release pressure and prolong food freshness. They help make your kitchen more efficient and organised, perfect for cooking and baking. Ideal for preparing and storing meals for the week, or taking to the office, school, or gym. Easy to clean: You can wash them in the dishwasher or simply wipe them clean with a sponge. The transparent glass containers with lids allow you to easily see the contents for convenient storage. They stack neatly in kitchen cupboards, saving space and freeing up valuable storage in your pantry, freezer or cupboards, keeping your kitchen tidier.