A non-tea-based, packaged beverage with a green tea extract mixed therein contains the following ingredients (A) and (B): (A) 0.06 to 0.5 wt. % of non-polymer catechins, and (B) 9 to 13.5 mM of citric acid or a salt thereof. Its pH is from 3.4 to 4.2. The non-tea-based, packaged beverage contains catechins at a high concentration, is reduced in bitterness and astringency, is suited for long-term drinking, and is excellent in the stability of bitterness and astringency and also in the feeling as it passes down the throat, and moreover, its color tone remains stable over a long term even when packed in a clear package and stored at high temperatures.