Patent ID: 8870443

Claim:
A flexible pouch ( 1 ) with a mixing apparatus, comprising: a length-adjustable mixer shaft divided into at least first and second shaft elements ( 4 , 5 ), the first shaft element ( 4 ) having a hollow body ( 6 ), the second shaft element ( 5 ) having a filler body ( 7 ) displaceably received in the hollow body ( 6 ) of the first shaft element ( 4 ), at least one resilient element ( 9 ) disposed in a gap between the hollow body ( 6 ) of the first shaft element ( 4 ) and the filler body ( 7 ) of the second shaft element ( 5 ), and a duct ( 10 ) being formed through a wall of the hollow body ( 6 ) and connecting a closed cavity of the mixer shaft to an interior ( 2 ) of the flexible pouch ( 1 ) achieve pressure equalization between the closed cavity and the interior ( 2 ) of the flexible pouch ( 1 ).