An expandable insulated delivery backpack originally designed for pizzas, this bag adapts to bicycle, walking, or public transit deliveries and folds flat for compact storage. Key benefits: Versatile delivery solution: Expandable design supports pizza orders and other hot foods, making it suitable for bike, foot, or transit delivery with easy storage when not in use. Reliable heat retention: Longlasting Oxford fabric, PE foam, and aluminum film, reinforced by internal support rods to maintain temperature during transit. Generous and secure capacity: Spacious interior keeps piping hot dishes organized and prevents shifting, so food stays hot upon arrival. Durable and stable design: Multiple base supports and two side boards preserve shape and improve load capacity for safer storage of heavy orders. Use scenarios: A busy pizzeria delivering multiple pizzas by bike across town. Cafes or food trucks delivering to offices or campuses on foot or via transit. Catering events requiring hot entrees and sides transported safely over longer distances.