Abstract: A coaster having a circular base, a cylindrical wall, an annular flange, and an opening. The circular base has a perimeter. The cylindrical wall emanates upwardly from the perimeter and the cylindrical wall has a top and a bottom. The annular flange extends inwardly from the top of the cylindrical wall and the annular flange has a rim opposite the top of the cylindrical wall. The circular base, the cylindrical wall, and the annular flange partially enclose a space and the space is operatively arranged to receive a container. The opening is bounded by the rim. Preferably, when the container is inserted through the opening into the space, the rim engages the container and removably secures the coaster to the container.