Roux culture bottle
A Roux culture bottle, or simply Roux bottle, is a type of laboratory glassware used in biology and related sciences to grow microorganisms or tissue cells. It consists of a bottle of transparent glass or plastic with two closely spaced flat, rectangular, parallel faces and a short neck; of such a design that the bottle can be laid down sideways, on one of those two faces, even when unstoppered and partially filled with a culture medium.