A refill bottle that includes a refill and an enclosure having a body and a cap engaging through an attachment device. The cap has three parts, an external cap with an enveloping skirt, an internal cap provided with a locking mechanism, and an actuation ring able to move about the spout of the refill. The attachment device includes a fixed hook on the body and a pivoting hook on the internal cap, the pivoting hook being disposed on a lever of the first type that pivots about a hinge integrated in the molding, and the actuation ring acts by rotation of the end of the lever opposite to the hook. Application to cosmetics bottles.