The inner layers are constructed of stainless steel for easy cleaning, while the exterior is constructed of high-impact plastic. Each tier is fully sealed, so you don’t have to worry about your lunch spilling over no matter where you are. Pack everything from soups, sandwiches, and fruits! With multiple tiers you can easily classify your meals according to your meals. A great food carrier to bring while hiking, camping, commuting to work, and the perfect lunch box to use for school.