The Steel Lock stainless steel lunch box with insulated bag comprises of two containers that come with an airtight lid. The lid of this tiffin box is designed with special locking system and a silicone band that prevents spillage. This stainless steel lunch box from Steel Lock comes with an insulated bag that maintains the temperature, keeps the food fresh and warm until consumed. The insulated bag has a zip closure that keeps the containers in place to prevent spillage and maintain the temperature. It is made with a combination of stainless steel and silicone.This sturdy tiffin box is airtight, which prevents any contamination of food and prevents spillage.