A cold soft drink is kept on the balance. When the cap is open, then the weight

Soft drinks contains

A cylinder with height and radius 2:1 is filled with soft drink and then it is tilted so as to allow some soft drink to flow off to an extent where the level of soft drink just touches the lowest point of the upper mouth.If 2.1 L of soft drink is retained in the cylinder,what is the capacity of the cylinder?