Soda Up / cup & soda keeper

It is not easy to prevent the soda from going flat. It happens because carbonated beverage has higher air pressure than atmospheric pressure (1atm), also after open it, there is always a small gap between the bottle and the cap, and it allows the carbonic acid to come out from the bottle. “SODA UP” is a cup which helps soda keep its fizz. It holds soda bottle upside down with its 3 dents, so it places the opening at the bottom and blocks the opening with the liquid in order to slow down the speed of a gas leak from the soda. It functions both as a cup and a soda keeper, and its stackable shape is designed for space-saving and storing.