There is provided a liquid containing bag capable of supplying mixture directly to a cooling cylinder from the bag without depending on gravity and without moving the mixture into a hopper. A liquid containing bag 5 comprises a bag main body 21 containing a liquid and having flexibility, and an outer layer member 23 disposed outside the bag main body 21, capable of forming a sealed space between the outer layer member and the bag main body 21, and having flexibility. Therefore, for example, when compressed air is sealed between the outer layer member 23 and the bag main body 21, an volume of the sealed space between them is enlarged, and the liquid cooled in the bag main body 21 can be pushed to the outside.
