Abstract: A cap may include a top and a sidewall depending from the top. A plug may also extend from the top, spaced from the sidewall. Threads are formed either on an internal surface of the sidewall, i.e., generally facing the plug, or on an external surface of the plug, i.e., generally facing the sidewall. The spacing between the sidewall and the plug generally defines a receptacle configured for receiving an open end of a container. The sidewall and the plug may be angled relative to each other, such that the receptacle has a cross-section that is generally V-shaped.

Abstract: In some implementations, an applicator includes a container and an insert disposed in the container. The insert may include a flange extending radially outwardly from an elongate post, and a porous tip covering the flange. A passageway is provided to convey, via material comprising the porous tip, a substance contained in the container to an external surface of the porous tip for application.