A pre-filled stemmed glass has product sealed inside using a rigid lock-on cap. The stemmed glass illustratively includes a circumferential ledge with a groove against which the bottom rim of the cap seats, creating a liquid resistant barrier that could help prevent liquid from penetrating under the cap from the outside, if desired. The stemmed glass has a rim with a rounded profile at the outside surface of the glass and a flat profile on the inside surface thereof, facilitating injection-molding manufacture of the glass. The ledge and the lower rim of the cap of the stemmed glass have the same diameter, which facilitates the filling with product and capping of the stemmed glass by high-speed filling and capping machinery.