A recipient for cell cultivation having an inner compartment adapted for cell growth, in one embodiment, an outer tubular wall extends in a longitudinal direction and delimits an outer boundary of the inner compartment in a radial direction. First and second ends delimit the inner compartment at the first respectively the second outer end of the outer tubular wail. A fixed packing in the inner compartment comprises a packing, such as a fiber matrix. Additional embodiments and related methods are also disclosed.