Type: Insulated backpack, lunch box cooler, or sling bag, often sold as part of a set. Material: The exterior is a heathered or denim-look polyester fabric, typically with an insulated, leak-proof lining inside. Features: It typically features a main zippered compartment, a front zippered pocket, a top handle, and adjustable shoulder straps. Color: The bag in the image appears to be gray or a blue-gray denim color. These types of bags are designed to keep food and drinks cool and fresh, making them suitable for work, school, picnics, or travel.