A flat cardboard blank forms tubular envelope type packaging for a pack of jars. The blank extends substantially along a plane formed by a longitudinal axis and a transverse axis perpendicular to the longitudinal axis, where the plane further defines a packaging axis substantially perpendicular to the plane. The blank includes: tubular-blank panels including at least one top panel, two lateral panels, a base panel, a unit for securely attaching for closing the expanded blank on itself; cut lines, slot lines and score lines between the tubular-blank panels for folding the tubular-blank panels, expanding the blank and shaping the packaging of the pack; and a spacing/bracing part connected to the tubular-blank panels by cut lines, detachable from the tubular-blank panels when the packaging of the pack is shaped for being arranged and expanded into the bracing spacer and forming bracing walls of the braced jars on the lateral walls.

A flat cardboard blank forms tubular envelope type packaging for a pack of jars. The blank extends substantially along a plane formed by a longitudinal axis and a transverse axis perpendicular to the longitudinal axis, where the plane further defines a packaging axis substantially perpendicular to the plane. The blank includes: tubular-blank panels including at least one top panel, two lateral panels, a base panel, a unit for securely attaching for closing the expanded blank on itself; cut lines, slot lines and score lines between the tubular-blank panels for folding the tubular-blank panels, expanding the blank and shaping the packaging of the pack; and a spacing/bracing part connected to the tubular-blank panels by cut lines, detachable from the tubular-blank panels when the packaging of the pack is shaped for being arranged and expanded into the bracing spacer and forming bracing walls of the braced jars on the lateral walls.

A blank includes: a top panel, two side panels, a base panel, a closure panel, and a securing member for closing the erected blank on itself, four sets of corner post panels each extending from a side panel and able to be erected to form corner posts, a receiving portion extending over a portion of the base panel, for receiving the bottom walls of pots, delimited transversely by two intermediate base score lines which define, with the ends of the base panel, two connection/deformation sections on either side of the receiving portion. The intermediate base score lines form two deformable hinges, so that the receiving portion can be moved relative to the ends of the base panel along a vertical axis after formation of the packaging and the pack.