Why doesn't Maotai have a bottle mouth?

Hello, I want to ask why Maotai has no bottle cap. Because Maotai has a bottle sealing rubber cap, it doesn't need a bottle cap. The alcohol content of Maotai is 53 degrees, so insects can't get close to their bodies. However, highly distilled liquor is afraid of leaking and "running", but Maotai Mountain is steep, with bumpy transportation and frequent leaking and "running". So, a hundred years ago, Maotai people came up with such an idea of sealing bottles, which has been used to this day and is also a kind of inheritance. Maotai's bottle sealing rubber cap has been sealed tightly, so there is no need for a bottle cap. So Maotai has no bottle cap.