Disclosed is a fluid bag including a main body having a fluid storage space capable of containing a fluid, an air storage space capable of containing air, and a pressing bag capable of inflating to press the main body when the air storage space is filled with the air, wherein the pressing bag is integrally connected to the main body, and wherein the air storage space includes one or more unit spaces connected to each other and spatially divided by boundary lines. According to the present invention, the main body may be pressed within a short time without excessively inflating the pressing bag, and a user may not feel anxious that the pressing bag would excessively inflate and burst.
