NOVELTY - A high vapor pressure substance enclosed in a flexible pouch, exerts pressure on the refrigerant liquid in another flexible pouch for assisting liquid to conduit connected with an evaporator (2008).    USE - For sorption cooling devices used in modern shipping industry, high value pharmaceutical product or chemicals, shipment of biological product such as patient specimens to an external laboratory.    ADVANTAGE - Achieves lightweight cooling device which occupies less volume. Enables controlling container temperature over desired range. Maintains reduced temperature over extended time period. Reduces cost.    DETAILED DESCRIPTION - A liquid supply reservoir comprises:    (a) a rigid housing;    (b) a first flexible pouch storing high pressure vapor, disposed within the rigid housing;    (c) a second flexible pouch enclosing a liquid, disposed within the rigid housing adjacent to the first flexible pouch; and    (d) a liquid conduit for providing liquid communication between the second flexible pouch and an evaporator.    The high vapor pressure substance causes the flexible pouch to exert pressure on the second flexible pouch, hence assisting the flow of liquid the second pouch to the liquid conduit.    INDEPENDENT CLAIMS are also included for:    (1) Sorption cooling device which has an evaporator, an absorber to absorb vapor from evaporator through a passageway. A reservoir is provided to supply refrigerant liquid to evaporator. A conduit provided between reservoir and evaporator, conveys liquid from reservoir to evaporator upon activation of the sorption cooling device;    (2) Method for operating a sorption cooling device involves using an evaporator for cooling and absorber for absorbing vapor in the evaporator. Liquids are supplied to evaporation at different rates, different volumes and different time or simultaneously. The composition of liquids are different;    (3) Temperature controlled shipping container (2000) which has a bottom case with cavity formed by bottom plate and side wall plates to accommodate a product and a top case which is placed on the bottom case. At least one sorption cooling device is disposed in top portion; and    (4) Method for transporting a product which involves placing the product in cavity formed between top and bottom plates of the container. A sorption cooling device is placed in thermal communication with the cavity so as to cool cavity upon activation. The sorption cooler is activated to initiate cooling of the cavity and the product is transported from one location to other locations and the product is removed. During transportation, the product is maintained at a temperature not more than 8 degrees C for 24 hours to 72 hours. The shipping container is in the form of shipping envelope.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of the temperature controlled shipping container.    Temperature controlled shipping container (2000)    Evaporator (2008)    Cavity (2030)    Product (2032)