The invention relates to a pouch (6) having a flexible casing delimiting a reservoir wherein a product to be dispensed is intended to be conditions, said pouch being provided with a tip (19) comprising a base that has an exterior wall whereon is fixed in a sealed manner a mouth (21), said tip having a duct extending between a lower opening and an upper opening, the tip (19) also having a well that extends between an interior opening and a lateral opening coming out into the exterior wall by being covered in a sealed manner by the mouth (20), the upper opening opening to the exterior of the pouch (6), said tip being provided with a cap (26) which is arranged in order to be able to be mounted in said upper opening by closing in a sealed manner the communication between the reservoir and the exterior while still leaving open the communication between the reservoir and the well.