Abstract: A container system and a method of its use is disclosed. The container system comprises a first container attachable to a second container. Each of the first and second containers include a housing open at one end thereof and defining an internal volume therein. An attachable closure seals each open end. The first container includes either a reception means or an attachment means in a second end thereof. The reception means is for receiving a separate attachment means, which may be a separate piece or integrally formed with the attachable closure of the second container. A variety of embodiments may be made as needed with various forms of an attachment means. For example, the second container may or may not include a second closure means, and may or may not include a threaded male portion based on the attachment means including or not including a cooperating threaded female portion.