Corona Extra, labeled as Coronita in Spain (literally, little crown), more commonly known as just Corona in the US, is the top selling important beer in the US, which is owned and produced by Cerveceria Modelo. It didn't get that way purely by being an excellent drink, with great products come great marketing teams! Corona beer is available in a variety of bottled presentations, anywhere from 6.4 fl oz. to 31.8 fl oz. Which such a large product line they normally choose an average size bottle to advertise in posters and commercials. As you can see in the ad below, they're luring in the customer by using the appeal of alcohol as well as the appeal of a nude beach.
Enjoy the Ad!