<p>A locking means for a cap resistant to impact forces and providing a leak-tight fitting to a container whilst allowing simple and quick ease. Said locking means comprises : (i) A panel (25) connected to a lid (3) of said cap (1) on at least a portion of the perimeter thereof; (ii) At least one protrusion (26) extending from a portion of said panel (25) towards the inside of said lid (3) for coupling with a slot (27) provided in a portion of a cap body (2) of said cap (1); and (iii) An elastically deformable material (28) connecting said panel (25) to said lid (3)</p>
