A flexible container for holding a liquid includes two walls made of a flexible material, the free overlaying edges of the walls being assembled together by a weld or an adhesive seam so as to define an inner sealed volume of the container. The two walls also define a spout designed to protrude outwards from a peripheral portion of the container, and an outflow channel connects the spout with the inner volume of the container. One or several obstacles are formed by welding or bonding together the two walls in the inner volume, substantially opposite from and in the vicinity of, the channel leading to the spout in such a manner as to limit the section of the passage available for the liquid between the inner volume and the outflow channel. One narrowed passage is left open in such a manner that a portion of the surface including the spout is deflected. This portion of the surface is substantially defined by the obstacle(s) and by folds directed substantially transverse with respect to the obstacles.