Pack, system and method for preparing beverages

The invention concerns pack (1) with an inner volume (2) in which a food or beverage ingredient (7) is stored and in which a beverage is produced when water is introduced inside,-said inner volume (2) being defined by two sheets of material (10) joined to one another at their edges and said inner volume (2) presenting a generally plane shape defining a plane (P) vertically oriented during beverage production,-said pack comprising at least one inlet (3) for introducing water in the inner volume and at least one outlet (4) for delivering the beverage from said inner volume, the water inlet (3) and the beverage outlet (4) being included in one single insert (5), said single insert (5) being positioned at the bottom of the pack and being partially positioned between two joined edges of the sheets of material (10), the water inlet (3) being oriented essentially perpendicularly to the plane (P) defined by the inner volume (2), and-wherein the single insert (5) comprises a centring hole (53) extending essentially perpendicularly to the generally plane (P) shape of the inner volume.