A flexible container (1) for holding a liquid including two walls (10, 11) made of a flexible material, the free overlaying edges of said walls being assembled together by a weld or an adhesive seam (12), so as to define an inner sealed volume of said container, the two said walls also defining a spout (13) designed to protrude outwards from a peripheral portion of the container, and an outflow channel (130) connecting said spout with said inner volume of said container, characterized in that one or several obstacles (14, 14') formed by welding or bonding together the two walls is or are located in said inner volume substantially opposite and in the vicinity of the channel (130) leading to the spout (13) in such a manner as to limit the section of the passage available for the liquid between the inner volume and the outflow channel, while leaving open at least one narrowed passage (140, 141, 146) and in such a manner that a portion of the surface including the spout is deflected, this portion of the surface being substantially defined by the obstacle or the obstacles and by folds directed substantially transversally (142, 143) with respect to said obstacles.