The stirred-tank reactor is the most commonly utilized reactor type in biotechnology. The Thermo Scientific™ HyPerforma™ Single-Use Bioreactor (S.U.B.) is designed as a stirred-tank reactor for animal cell culture and has the unique advantage of utilizing completely single-use product contact surfaces. This design is based on years of traditional successful stirred-tank reactor design and operation. Working volumes of 25 L to 2000 L are now supported using this technology.