Abstract: A screw-type safety cap for use in combination with a bottle is disclosed wherein the bottle is of the type having a threaded neck with a top planar edge. The cap includes a top wall and a depending peripheral skirt. The skirt has a thread on the inner surface thereof for rotatably engaging and securing the cap with the threaded neck of the bottle. The cap has a resilient member disposed under the top of the cap for engaging the top edge of the neck. The threads of the cap and the threads of the bottle are so dimensioned in thickness and space therebetween that the cap is axially slidable with respect to the bottle. The threads on the bottle have at least two interruptions which form at least two recesses in the threads of the bottle. The cap has at least two projections on the inner surface of the skirt. The projections are spaced both axially and radially with respect to each other as are the two recesses in the bottle thread.