Abstract: The invention relates to a bag for foodstuffs including a base, and also two principal walls and two lateral flanks extending from said base, these walls and flanks being made from a material of flexible-sheet type, the two walls being, at their end opposite the base, assembled together along an assembling line, the two flanks, at their end opposite the base, being shaped as a gusset. The bag also includes an opening line which extends, in the region shaped as a gusset, of one lateral flank, in the vicinity of one end of the region opposite the base, said region forming a gusset being capable of adopting two positions when the opening line is open. One position corresponds to its position when the bag is closed, the other being one in which the gusset shape is turned out and defines a pouring spout capable of guiding the foodstuffs as far as the opening.