Double-layer Thermal Insulation Lunch Box Stainless Steel Bento Box with Handle School Office Camping Portable Food Container. The lunch box is made of a combination of stainless steel and PP material, which makes it durable and long-lasting. It has a double-layer design, perfect for packing a healthy and filling meal for one person. The meal box features a modern warm style design with a stainless steel inner liner and a plastic outer shell that is easy to clean. The lunch box is an eco-friendly alternative to disposable containers, as it can be used repeatedly and is made from materials that are recyclable.