A flexible package having an inner sheet having a first surface and a second surface. The flexible package has an article reservoir for accepting an article to be shipped and one or more expansion chambers. The expansion chambers can be inflated or otherwise expanded to provide structure to the flexible package and to protect the article in the article reservoir.

A flexible package having an inner sheet having a first surface and a second surface. The flexible package has an article reservoir for accepting an article to be shipped and one or more expansion chambers. The expansion chambers can be inflated or otherwise expanded to provide structure to the flexible package and to protect the article in the article reservoir.

A container blank (1), so sized and shaped as to form a shipping pack having front (2) and rear (3) walls to which there are attached, along respective fold lines (2a, 2b, 3a), side wall sections (11, 12;16, 17) each being foldable so that said front and rear walls are in juxtaposed alignment, wherein an interior open-mouthed bag (30) is adhered to the inner surfaces of the front and rear walls. When a shipping pack is erected from said container blank, the folded interior bag (30) is deployed to align with the inner volume of said erected pack so as to provide an open-mouthed container with open-mouthed interior bag to be filled and subsequently sealed for dispatch. The shipping pack is configurable in a folded flat stackable form having an interior bag in situ for storage or dispatch and is easily machine assembled or manually formed into an open-mouthed shipping pack at point of use.