Water storage unit with dual bladders

A water storage unit comprising:

• an outer bag including a first plate, a second plate which is fixed to the first plate, and an inlet defined in a top end of the outer bag;
• an inner bag including a third plate and a fourth plate which is fixed to the third plate, the inner bag received in the outer bag, the inner bag having an opening defined in a top end thereof, two cutouts defined in two sides of the inner bag, said cutouts not in communication with an interior of the inner bag;
• a coolant bag received in the inner bag and coolant received in the coolant bag, the coolant bag having a circular seam on a center thereof, and
• a handle connected to the inlet of the outer bag by wrapping the inlet around a sealing rod, said sealing rod engaged with a clamp slot defined in an underside of the handle to seal the inlet of the outer bag, the clamp slot including a guide opening in one end and a closed end on the other end, a through hole defined through the closed end, an elongate slit defined between two parts of the clamp slot wherein the inlet of the outer bag passes through the slit, said sealing rod having two connection parts on a first end thereof, the connection parts engaged with the through hole in a snap fit, the sealing rod having multiple axial ridges extending radially therefrom so as to be engaged with the inlet of the outer bag and the insides of the clamp slot.