a container is provided for cell growth by artificial cultivation of selected biological material in a growth media for use in an oscillating incubator . the container has a circular bottom with rounded corners joining a sidewall that is inclined at an angle toward a longitudinal axis of the container to define a container volume . the bottom has six equally spaced baffles extending inward from the corners and upward toward a large diameter opening of the container centered on the longitudinal axis . the baffles have a triangular cross - sectional shape with an included angle of about 28 - 40 °, and a height measured parallel to the longitudinal axis of about 15 - 25 % of the usable container volume . the baffles end before the longitudinal axis . the container and baffles are blow molded from a polymer suitable for blow molding . an air permeable filter is placed over the container opening , with the filter having an adhesive on one side to stick to the container . a finger tab on the periphery of the filter helps to position and remove the filter . a growth media is placed in the container along with a biological material to be cultured and rotated from about 250 rpm to 450 rpm depending on the volume of the material and the container . the growth media comprises mgbr 2 , cubr 2 , febr 2 , tris , tris - hbr , tris - acetate , or tris - hcl , kbr , adenine , palmitic acid , glycerol or d -- glucose , or both , atp , protein hydrolysate amicase or other casamino acids , yeast or yeast extract , tryptone peptone , anti - foam and de - ionized water .