Come and see our amazing products. Kids Students Neoprene Lunch Bags is made of flexible and durable neoprene, which is waterproof and thermal insulation material. The bag keeps food cold or warm for up to 4 hours, depending on the outside temperature. The flat bottom keeps it upright, perfect for bottles or dishes that you don't want tipping over. Soft-grip handle makes it easy to carry. Pls confirm with us about the packing info, stock status and exact production time before placing your orders.