Milk cartons are containers designed to hold and preserve liquid milk. They are typically made from paperboard, which is coated with a thin layer of plastic or aluminum to prevent leaks and keep the milk fresh. Milk cartons come in various sizes, ranging from small single-serving cartons to larger ones for families. These cartons are often used in grocery stores and schools, making it easy to transport and store milk. Many milk cartons feature a convenient opening mechanism, such as a twist-off cap or a pull-tab, allowing for easy pouring. They are also recyclable, contributing to environmental sustainability.