Package for storing a product

A package unitarily formed from a cardboard blank for storing a product, the package comprising:

• a back wall,
• a first hinged lid section and a second hinged lid section to set the package in an open or a closed position, the first and the second hinged lid sections being opposite the back wall when the package is in the closed position,
• a first pair of side walls, the side walls of the first pair being arranged opposite each other and extending from the back wall,
• the first hinged lid section extending from one of the side walls of the first pair and the second hinged lid section extending from the other side wall of the first pair, and
• a second pair of side walls, the side walls of the second pair being arranged opposite each other and extending from the back wall, each of the side walls of the second pair comprising an extension that forms a stiffening member, wherein
• the stiffening member is U-shaped comprising a base, a first leg and a second leg, the first and the second leg being arranged opposite each other and extending substantially perpendicular from the base, and the first leg is attached to the back wall, and the second leg supports the first hinged lid section and the second hinged lid section when the package is set in the closed position, and wherein
• the back wall comprises at least one crease extending between the U-shaped stiffening members, and at each end of the crease an intersection is provided which extends from the crease to one of the hinged lid sections to provide an indentation when the package is set in the closed position.