Container with fold-out opening, resulting from the suitable bending and folding of a laminar body that has bending lines that define four rectangular walls, which have a common upper flap and another, common lower flap with bending lines; the upper flap has two folding lines that continue two transverse bending lines defining a wall that is in a central position; said folding lines defining three rectangular portions of the upper flap; the central portion having the same axis of symmetry as the central wall; each of the portions is provided with additions opposite the contact thereof with the walls; the addition having a tear line that divides the addition into two dividing parts; the portion having a slot and the addition having a tab in the dividing part thereof and which can be engaged and inserted into the slot.