Pack for the preparation of a food or beverage product comprising an insert and a container, the container being configured by at least one flexible sheet folded in such a way to configure a container where ingredients for the food or beverage product are stored, the insert being overwrapped by the at least one flexible sheet configuring the container, and the insert comprising at least two parts (101, 102) moveable with respect to each other, providing open or close communication with the inner volume of the container.water to extract and/or infuse and/or dissolve and/or reconstitute the ingredients in the container and to prepare the food or beverage product can be introduced through the insert through an injection hole and into an inlet chamber, the food or beverage product once prepared being also dispensed through this insert, the pack presenting a generally plane shape and being essentially vertically oriented during food or beverage production with the insert arranged at the lower side of the pack so the water is supplied into the volume of the container in an upward direction; characterized in that: the pack further comprising an inlet channel arranged at the inlet chamber and extending vertically inside the volume of the container in such a way that the water introduced via the insert is conducted by the channel and enters the inner volume of the container through this channel, and the inlet channel comprises an essentially vertical tube of a certain length (Hpipe), the height (Hpipe) of the channel in the volume of the container being such that it is arranged above the ingredients in the container and allows the water exiting the channel to wet the ingredients from the upper part of these, avoiding turbulence, and, and - the tube configuring the inlet channel is made of the same material as the insert. the container being configured by at least one flexible sheet folded in such a way to configure a container where ingredients for the food or beverage product are stored, the insert being overwrapped by the at least one flexible sheet configuring the container, and the insert comprising at least two parts (101, 102) moveable with respect to each other, providing open or close communication with the inner volume of the container.water to extract and/or infuse and/or dissolve and/or reconstitute the ingredients in the container and to prepare the food or beverage product can be introduced through the insert through an injection hole and into an inlet chamber, the food or beverage product once prepared being also dispensed through this insert, the pack presenting a generally plane shape and being essentially vertically oriented during food or beverage production with the insert arranged at the lower side of the pack so the water is supplied into the volume of the container in an upward direction; characterized in that: the pack further comprising an inlet channel arranged at the inlet chamber and extending vertically inside the volume of the container in such a way that the water introduced via the insert is conducted by the channel and enters the inner volume of the container through this channel, and the inlet channel comprises an essentially vertical tube of a certain length (Hpipe), the height (Hpipe) of the channel in the volume of the container being such that it is arranged above the ingredients in the container and allows the water exiting the channel to wet the ingredients from the upper part of these, avoiding turbulence, and, and - the tube configuring the inlet channel is made of the same material as the insert.