A packaging for a food product comprising: - an outer container longitudinally extending about a central axis from a bottom to an upper face having an opening, the outer container having a peripheral upper rim delimiting the opening and a sidewall defining an interior volume of a determined height, the sidewall having two opposite inner faces (F1, F2), preferably planar, - a closure system comprising a frame which is annular and fixed in a removable manner to the peripheral upper rim, and a lid which closes the opening of the outer container in a closed position, the frame comprising an upper fitment part covering the upper rim; and - a gusset bag filled with food product and flexible, comprising a bottom, an upper end adapted to define an opening of the bag at the opposite from the bottom, an annular side wall provided with at least one gusset (9a, 9b), preferably two opposite gussets, so that the bag is adapted to unfold from a partially open configuration to a fully open configuration; wherein the sidewall of the outer container surrounds closely the annular side wall of the bag, is adapted to guide the bag along a vertical direction parallel to the central axis and has a shape matching with the annular side wall of the bag, the cross section shape of the annular side wall of the bag being similar to the cross section shape of the side wall of the outer container so as to locate the bag in a predetermined position along the sidewall inside the interior volume, the bag having an opening facing upwardly at the opposite from the bottom in the predetermined position, wherein the lid is hinged to the frame to allow movement of the lid between an open position and the closed position, characterized in that the frame further comprises: - an insert part that extends in the interior volume and is radially spaced inwardly from the sidewall of the outer container, the insert part extending annularly entirely below the upper rim, - a plurality of axial guiding extensions (E1, E2, E3, E4; E4') that belong to the insert part and configured to engage the bag through the opening of the bag to hold open the bag, the insert part having a notch (61, 62) defined between two of the axial guiding extensions, along one of said two opposite inner faces (F1, F2). - an outer container longitudinally extending about a central axis from a bottom to an upper face having an opening, the outer container having a peripheral upper rim delimiting the opening and a sidewall defining an interior volume of a determined height, the sidewall having two opposite inner faces (F1, F2), preferably planar, - a closure system comprising a frame which is annular and fixed in a removable manner to the peripheral upper rim, and a lid which closes the opening of the outer container in a closed position, the frame comprising an upper fitment part covering the upper rim; and - a gusset bag filled with food product and flexible, comprising a bottom, an upper end adapted to define an opening of the bag at the opposite from the bottom, an annular side wall provided with at least one gusset (9a, 9b), preferably two opposite gussets, so that the bag is adapted to unfold from a partially open configuration to a fully open configuration; - an insert part that extends in the interior volume and is radially spaced inwardly from the sidewall of the outer container, the insert part extending annularly entirely below the upper rim, - a plurality of axial guiding extensions (E1, E2, E3, E4; E4') that belong to the insert part and configured to engage the bag through the opening of the bag to hold open the bag, the insert part having a notch (61, 62) defined between two of the axial guiding extensions, along one of said two opposite inner faces (F1, F2).