Morpho-anatomic flexible web intended to be introduced into a vaginal or rectal cavity (40,50) of a human or animal by means of an applicator, said web being provided with means of removal from said vaginal or rectal cavity (40,50), - said web having a proximal end which corresponds to the part of the web that first contacts said cavity (40,50) and a distal end which corresponds to the part of the web that last enters said cavity (40,50) and - said web comprising two sheets (16,17) that at least partly overlap, defining an overlapping area, each of said sheets (16,17) being made of the same or different non-expandable or minimally expandable, foldable, atraumatic material such as a woven or non-woven textile made of synthetic fibers, semi-synthetic fibers, plant fibers, animal fibers or combinations thereof, having a thickness of less than 2mm, preferably less than 1mm; wherein - said first and second sheets (16,17) are fixed to one another by means of at least two stopping elements (11,12,13), defining in the interior of the overlapping area edges of a pouch for holding a substance, having one opening corresponding to a mouth of the pouch for receiving said substance, which mouth is situated upwards with respect to the edges, considering the direction of insertion of the web into said cavity, closer to the proximal end of the web; - at least one of the first and second sheets is permeable to the substance; and wherein - said web further comprises at least one blocking element for retaining the applicator in a substantially fixed position relative to the web, said blocking element having at least one blocking side which is perpendicular to the direction of insertion of the web into the vaginal or rectal cavity (40,50),. - said web having a proximal end which corresponds to the part of the web that first contacts said cavity (40,50) and a distal end which corresponds to the part of the web that last enters said cavity (40,50) and - said web comprising two sheets (16,17) that at least partly overlap, defining an overlapping area, each of said sheets (16,17) being made of the same or different non-expandable or minimally expandable, foldable, atraumatic material such as a woven or non-woven textile made of synthetic fibers, semi-synthetic fibers, plant fibers, animal fibers or combinations thereof, having a thickness of less than 2mm, preferably less than 1mm; wherein - said first and second sheets (16,17) are fixed to one another by means of at least two stopping elements (11,12,13), defining in the interior of the overlapping area edges of a pouch for holding a substance, having one opening corresponding to a mouth of the pouch for receiving said substance, which mouth is situated upwards with respect to the edges, considering the direction of insertion of the web into said cavity, closer to the proximal end of the web; - at least one of the first and second sheets is permeable to the substance; and wherein - said web further comprises at least one blocking element for retaining the applicator in a substantially fixed position relative to the web, said blocking element having at least one blocking side which is perpendicular to the direction of insertion of the web into the vaginal or rectal cavity (40,50),.