A mixing assembly includes a bag of appropriate size, configuration, shape and material and a closable spout that may have extensions of various lengths, shapes and configurations to provide enhanced mixing of a component contained in the bag upon the addition of a second component. Once the closure of the spout is removed, the second component, typically a liquid such as water, milk, juice, chemical, oil substrate, or the like, can be added to the container for mixing. After the closure is refitted, the two components are mixed then consumed or dispensed, either by removing the closure or from a separate spout or nozzle fitted to the closure.