... Bottle With Cover Made of natural rubber Resistant to boiling water 100% leak ... such as copperVol / size300ml – 2000mlFeature1, First grade natural rubber hot water bottle,2, Resistant to boiling water; 3, ... The hot water bag is made of by Natural Rubber material, also can with kinds of cover, it ... components at regular intervals5) When not in use, drain and store with the stopper removed in a cool, ...