Abstract: A bag includes a flap secured to the body of the bag, this flap being formed from a deformable piece and the bag further having at least two passages whose function is to allow the passage of a strap for the purpose of holding the flap on at least one wall of the body, the passages being situated at a sufficient distance from each other and disposed on the flap so that, when the flap is mounted on the body of the bag, the passages are opposite the wall in order to make it possible to secure the flap to the latter by the strap.