Bag having a concealed opening

A bag comprising:

• a first and a second wall connected together so as to define lateral sides and a bottom of the bag,
• a closure assembly comprising a first and a second support webs connected respectively to the first and to the second wall and each comprising a complementary closure element,
• the first support web being discontinuously connected over its length to the first wall of the bag so as to create at least one passage between this first support web and the first wall of the bag from the outside of the bag, said passage enabling local deformation of the first support web for modifying the relative local orientation of the closure elements when the walls of the bag are moved apart and making separation of the complementary closure elements easier,
• wherein the first support web has an upper edge and a lower edge, the lower edge being closer to the bottom of the bag than the upper edge, the upper edge of the first support web being continuously fixed to the first wall along a first section and being separated continuously from said first wall along a second section so as to create the passage, and
• wherein the first support web is divided into a lower part, an upper part and a middle part located between the lower part and the upper part.
• wherein the middle part bears the closure element,
• wherein the lower part is closer to the bottom than the upper part extends to a subjacent area of the closure element,
• wherein the lower part of the first support web is continuously fixed on the first wall along the second section either over all its height.