A carrying case for heated food containers, particularly slow cookers, has a flexible bottom wall, side wall and lid so that it can be adjusted to accommodate food containers of various different dimensions. A clamp assembly is provided for securely holding a lid on the food container within the carrying case to thereby minimize the likelihood of accidentally spilling its contents. Means are provided for carrying other items on the lid of the carrying case. The case has a belt which can be tightened to adjust the case to different sizes of containers and straps forming a handle.