Abstract: An advertising device, comprising a sidewall defining an internal volume for containing a liquid and having an upper open portion and a bottom portion is disclosed. A bottom member closes the said bottom portion. The upper portion of the sidewall extends inward in the region of the upper portion which is uppermost on the tubular sidewall. A bead extends along the outside parameter of the said radially inwardly extending portion of the tubular sidewall. A cap has a tubular sidewall whose cross-sectional shape substantially coincides with the cross-sectional shape of that portion of the tubular sidewall between the upper portion of the tubular sidewall and the lower portion of the sidewall. A top member is secured along the inside of the cap sidewall, the top closing said cap. The inside of the cap sidewall is configured to grip the head to securely close the upper portion with the cap top. The inside of the cap bottom, has ridges or protrusions, to hold the glass steady when the cap is being used as a coaster.