Package provided with a leaktight opening and closing device

A package of consumable product provided with a substantially plane wall and fitted with an orifice, comprising:

• an opening and closing device comprising a body in a single piece, made of moulded material, fixed on said wall, said body comprising a plate fitted with a hole placed opposite said orifice, supported essentially on an inner face of said wall, and fixed on an edge of said orifice of the wall in a leaktight manner, and a door articulated to this plate opening towards the interior of the package and capable of blocking this hole in a leaktight manner,
• an arm connected to said door, said arm cooperating with blocking means in a first position such that it keeps said door in a leaktight blocking position, and releasing said door by pivoting towards the interior of said package when it is disengaged from said blocking means, and
• a cover distinct from said body and of said arm, and which is fitted with a safety disc which must be broken during initial opening of said door, such that if said safety disc is intact, it is guaranteed that the package has never been opened previously, said disc forming part of said blocking means;
• wherein said cover comprises means for connecting with said plate, said cover, when it is connected to said plate, being located outside said package such that a region of said wall is sandwiched between said cover and said plate.