Rigid packaging, having: - a skeleton made of thermoplastic material, this skeleton having: • a lip surrounding an opening via which a product can be removed from the packaging, • a bottom, • strands mechanically connected to the bottom and to the lip and that form meshes of a grid that defines the framework of a lateral wall of the packaging, this lateral wall extending from the bottom as far as the lip and, in combination with the bottom, delimiting a hollow volume of at least 50 cm 3 capable of receiving the product, - a sheet heat sealed to the skeleton and closing off the meshes that define the lateral wall, characterized in that: - this sheet has, in order: • an internal layer made of thermoplastic material heat sealed to the strands of the skeleton, • a cardboard layer made of paper fibre aggregate, the mass of this cardboard layer representing more than 50% of the total mass of the sheet, - the energy of adhesion of the cardboard layer to the internal layer is lower than the energy of adhesion of the internal layer to the strands of the skeleton, and - the heat sealed sheet has a grasping appendage for the hand of a human being, this appendage being as one with the cardboard layer and making it possible, by manual pulling on this appendage, to manually peel the cardboard layer so as to detach it mechanically from the internal layer. - a skeleton made of thermoplastic material, this skeleton having: • a lip surrounding an opening via which a product can be removed from the packaging, • a bottom, • strands mechanically connected to the bottom and to the lip and that form meshes of a grid that defines the framework of a lateral wall of the packaging, this lateral wall extending from the bottom as far as the lip and, in combination with the bottom, delimiting a hollow volume of at least 50 cm 3 capable of receiving the product, • a lip surrounding an opening via which a product can be removed from the packaging, • a bottom, • strands mechanically connected to the bottom and to the lip and that form meshes of a grid that defines the framework of a lateral wall of the packaging, this lateral wall extending from the bottom as far as the lip and, in combination with the bottom, delimiting a hollow volume of at least 50 cm 3 capable of receiving the product, - a sheet heat sealed to the skeleton and closing off the meshes that define the lateral wall, - this sheet has, in order: • an internal layer made of thermoplastic material heat sealed to the strands of the skeleton, • a cardboard layer made of paper fibre aggregate, the mass of this cardboard layer representing more than 50% of the total mass of the sheet, • an internal layer made of thermoplastic material heat sealed to the strands of the skeleton, • a cardboard layer made of paper fibre aggregate, the mass of this cardboard layer representing more than 50% of the total mass of the sheet, - the energy of adhesion of the cardboard layer to the internal layer is lower than the energy of adhesion of the internal layer to the strands of the skeleton, and - the heat sealed sheet has a grasping appendage for the hand of a human being, this appendage being as one with the cardboard layer and making it possible, by manual pulling on this appendage, to manually peel the cardboard layer so as to detach it mechanically from the internal layer.