Abstract: A package envelope is provided with a plurality of interconnecting wall panels defining a plurality of expansion chambers which are inflatable to a predetermined pressure. At least one item-receiving zone is defined between at least one juxtaposed pair of the expansion chambers. The package includes means for releasably encapsulating an item within the item-receiving zone such that the item is supported against substantial lateral and rotational movement relative to the envelope even when the expansion chambers are not inflated to their predetermined pressure. A valve may be included for selectively controlling the flow of a filler medium, such as air, therethrough and into and out of the expansion chambers. When inflated, the expansion chambers substantially surround an item contained within each item-receiving zone.