In Mexico many of the bars you go to also have women who hang out and offer "companionship." This makes the men buy them drinks and helps out the bar. The women though would get way to drunk, so they kept custom ordering these size "estrella" bottles. (By the way, Estrella and Corona are the exact same beer, Corona is just the label they put on the bottle when it is exported or shipped to tourist areas) The price for the 7 oz bottles is the same as the 12 at the bar when you buy them for the women.