Coolrunnings is a container that keeps water or drinks refreshingly cool in the hot summer. Equipped with a twister-system cooling pin that functions as a bottle cap, this container is an effective way to prevent drinks from becoming warm. The liquid is cooled if shaken because the cooling pin located in the center accelerates convection and the heat is dissipated. The convection current is faster because the twister-like groove provides more resistance against the water than the slotted groove. The rubber cap is an effective seal to prevent any leakage.