Patent ID: 8448797

Claim:
A bottle, comprising: a bottle body having a mouth with an external thread formed around an outer circumferential surface of the mouth; an additive storage container having an end plate being in surface contact with an open end of the mouth, a main cap extending downward in an axial direction from an outer circumferential edge of the end plate and having an internal thread combined to the mouth through a screw-type engagement, an inner cap extending in an axial direction from an inner circumferential edge of the end plate and being movably inserted into the mouth, with a discharge port and a hook protrusion provided on an end of the inner cap; an opening unit comprising a finish plate provided on an upper part of the inner cap, an upper cap extending in an axial direction from an outer circumferential edge of the finishing plate provided on an upper part and having an internal thread combined to the outer circumferential surface of the main cap, and a slider extending in an axial direction from the end plate and movably inserted into the additive storage container in an axial direction, and sealed by a plug at an end thereof; wherein the plug has a seal protrusion that is combined to a seal groove formed on a lower end of the slider so that the plug is coupled to the slider to be separated from the slider; and wherein the plug is integrally formed on a lower end of the slider, with a thin tear-off line formed between the plug and the slider.