In the story of the deputation of AbdulQays Ibn Abbas said: They (the people) asked: In which should we drink, Prophet of Allah? The Prophet ﷺ said: You should use those skin vessels that are tied at their mouths.
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
Benefit: Perhaps when the mouth is tied, if sourness develops in it, then due to the gas, it swells up.
Thus, it becomes apparent that sourness has developed in it.
(Bazl al-Majhud)
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 3694