A foldable container moveable between a flat configuration and a three-dimensional configuration is provided. The container includes a first panel having a first engagement feature, a second panel having a second engagement feature, and a third panel having a third engagement feature. The first engagement feature is configured to engage with the second engagement feature so as to secure the container in the three-dimensional configuration. The first engagement feature is also configured to engage with the third engagement feature so as to inhibit the first engagement feature from becoming disengaged from the second engagement feature.

Packaging article, made by means of a sheet of folding material, the article including a base wall, sidewalls connected with the edges of the base wall by folding lines. Two preferably opposite sidewalls include an extension flap, which protrudes from ends of the sidewalls and is connected thereto by a folding line. The extension flap folds, arranging itself in face-to-face relationship with a portion of the adjacent sidewalls. The packaging article includes connection means for fixing the extension flap on the portion of the adjacent sidewalls. The connection means include a male element and a female element configured in such a way that a portion of the male element, when inserted into the female element, protrudes towards the outside of the formed packaging article.