The present invention relates to a fluidizing unit, comprising a cardboard structure 2, a deformable receptacle 3 disposed within the cardboard structure 2, and a fluidizing means 4 disposed within the deformable receptacle 3 and comprising a container 4a and a fluidizing base 4b covering the container 4a, the container 4a and the fluidizing base 4b constituting the outer walls of a pressure chamber 4c which can be charged with compressed air, the fluidizing means 4 further comprising a supply line 4d for compressed air, which opens out via the fluidizing base into the pressure chamber, and also a seal 4e which spans the periphery of the container 4a and is designed such that the interior 5 of the deformable receptacle 3 is separated into two regions 5a and 5b separate from one another.