A vehicle reservoir tank has an anti-spill chamber and an overflow channel. The anti-spill chamber has a body portion, an inlet at one end of the body portion and an outlet at another end of body portion. The anti-spill chamber is configured and arranged to restrict fluid flowing from a main reservoir chamber. The overflow channel has a first end portion, a second end portion and an intermediate curved portion. The first end portion is fluidly coupled to the outlet of the anti-spill chamber. The intermediate curved portion extends from the first end portion to the second end portion such that the second end portion of the overflow channel extends downwardly relative to the first end portion. The second end portion extends along an area of the body portion of the anti-spill chamber to restrict the flow from the anti-spill chamber.