Systems, methods, and machine-readable media for containerizing and adapting content items for delivery in a packet stream from a content provider system via one or more networks to an endpoint media device are disclosed. A content composite may be created for delivery in a packet stream from a content provider system to an endpoint media device. A containerization object may be configured with a container flag that indicates a content item and containerization specifications to facilitate performance of operations by the endpoint media device with respect to the content item. The content composite may be transmitted in accordance with composite transmission specifications. The endpoint media device may perform the operations facilitated by the containerization object of the content composite.