Abstract: A container for ensuring the transport and the aseptic transfer of a biopharmaceutical product from or to a closed chamber provided with a leaktight joining device, includes: an annular flange delimiting an opening, a removable cover, built-in elements for locking/unlocking the removable cover and a peripheral envelope. The built-in locking/unlocking elements include a built-in functional locking/unlocking arrangement formed by a through-housing formed in the annular flange and a blind housing formed in the removable cover, and by a pin at an inner radial position and a pin at an outer radial position. The container is capable of being in an initial locking position, in an intermediate unlocking position and in a final locking position owing to the displacements of the pin at an inner radial position and the pin at an outer radial position in the blind hole of the removable cover and in the through-housing of the annular flange.