A refillable bottle for dispensing a fluid product, comprising a container formed in a body. The bottle comprises a device for dispensing the packaged product mounted on the body in a sealed manner, and equipped with a valve for filling the container to allow a product source to be brought into communication with the container to fill the container. The valve comprises a conduit for communication between the source and the container, the conduit having a seat equipped with a flap valve movable relative to the seat between a sealed closed position and an open position of the conduit when the bottle is in an upside-down position. The flap valve has a device for resiliently stressing the seal in the closed position. The device can be uncoupled from the flap valve in order to release the subsequent movement of the flap valve between the closed and open positions thereof.