A disposable spinner flask includes an asymmetric container, a lid, and a spinning mechanism. The container can be sealingly coupled to the lid, which includes an access port and a cap configured to be coupled to the access port for preventing bacteria, viruses, and fungi from passing therethrough while allowing air to flow between the container and a surrounding environment. The lid may include a structure for retaining the cap when the cap is removed. The spinning mechanism can include a shaft, at least one blade, and a magnetic device. Further, the spinning mechanism can include a receptacle that fixedly receives the magnetic device toward an end of the blade assembly, the magnetic device configured to rotate when subjected to an external magnetic force.