The Lunch Pack is made of food grade containers made of stainless steel wrapped in a soft handcrafted carrying case, making it easy to transport and suitable for office , school and travel. It is made of plastic that ensures toughness and longevity. The jar lid consists of silicon seal, which locks in freshness and retains food moisture for long hours. This lunch box keeps your food fresh and hot for a long time, and all containers have airtight plastic lids that are leak-proof. Food won't come out of tubes, even though it's semi-liquid.