A
package for storage and dispensing of carbonated beverages. In one aspect, the
package generally includes a collapsible, flexible liquid
enclosure housed within an external container where the external container is precisely configured to correspond in size and shape with the liquid
enclosure when the liquid
enclosure is filled to the desired maximum volume. As such, the internal liquid enclosure and the external container cooperate to constrain the
internal pressure of the filled liquid enclosure. The external container may be generally sleeve-like with top and bottom ends closed by end caps. In one aspect, the liquid enclosure may include a valve fitment seating a conventional
Schrader valve through which fluid can be introduced into and dispensed from the liquid enclosure. The present invention also provides a method of filling a
package in which the liquid is not carbonated until after it has been introduced into the liquid enclosure.