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A flexible container having a flexible pouch with a valve assembly mounted thereon is secured to a dispensing container in a sealed relationship with the valve assembly. Then the flexible pouch is squeezed in order to move a fluid from the flexible pouch through the valve assembly into the dispensin

A flexible container having a flexible pouch with a valve assembly mounted thereon is secured to a dispensing container in a sealed relationship with the valve assembly. Then the flexible pouch is squeezed in order to move a fluid from the flexible pouch through the valve assembly into the dispensing container. The dispensing container is thus refilled and made ready for use.

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A flexible container having a flexible pouch with a valve assembly mounted thereon is secured to a dispensing container in a sealed relationship with the valve assembly. Then the flexible pouch is squeezed in order to move a fluid from the flexible pouch through the valve assembly into the dispensin

A flexible container having a flexible pouch with a valve assembly mounted thereon is secured to a dispensing container in a sealed relationship with the valve assembly. Then the flexible pouch is squeezed in order to move a fluid from the flexible pouch through the valve assembly into the dispensing container. The dispensing container is thus refilled and made ready for use. ned by: a) drawing a sample of gasoline from the gasoline stream; b) measuring the vapor pressure of the sample of gasoline; c) returning the sample of gasoline to the gasoline stream; d) drawing a sample of butane from the butane stream; e) measuring the vapor pressure of the sample of butane; and f) returning the sample of butane to the gasoline stream. 16. The method of claim 14, wherein the step of determining the blend ratio comprises: a) setting a predetermined value for the vapor pressure of the blend; b) transmitting the predetermined value for the vapor pressure of the blend to a processing unit; c) transmitting the gasoline vapor pressure and the butane vapor pressure to the processing unit; d) calculating the blend ratio from the gasoline vapor pressure, the butane vapor pressure, and the predetermined value for the vapor pressure of the blend. 17. The method of claim 16, further comprising: a) transmitting a signal that corresponds to the vapor pressure of the blend from the processing unit to a programmable logic control; and b) adjusting the ratio of butane and gasoline blended in the blending unit with the programmable logic control. 18. A method for optimizing butane purchase decisions for a petroleum products tank farm comprising: a) in an information processing unit, setting a value for the quantity of butane in a tank at time zero; b) drawing a butane stream from the tank of butane; c) blending the butane stream with gasoline for a first interval of time from time zero until time one; d) monitoring the consumption of butane blended with the gasoline during the first interval of time, and transmitting data regarding the consumption during the first interval of time to the information processing unit; and e) transforming the consumption data during the first interval of time, and the butane quantity at time zero, to an output of data comprising the butane consumption rate during the first interval of time, and the quantity of butane in the tank at time one. 19. The method of claim 18 further comprising: a) blending the butane stream with gasoline for a second interval of time from time one until time two; b) monitoring the consumption of butane blended with the gasoline during the second time interval, and transmitting data regarding the consumption during the second time interval to the information processing unit; c) transforming the consumption data during the second interval of time, and the butane quantity at time one, to an output of data comprising the butane consumption rate during the second interval of time, and the quantity of butane in the tank at time two; and d) repeating steps a) through c) for one or more succeeding intervals of time. 20. The method of claim 18 wherein the butane stream and the gasoline are blended at a ratio that attains a prescribed vapor pressure. 21. The method of claim 20 wherein the ratio varies due to variations in the vapor pressure of the gasoline and/or the butane stream. 22. The method of claim 18 further comprising: a) inputting to the information processing unit a plurality of time dependent vapor pressure values; b) blending the butane and gasoline at ratios that attain the time dependent vapor pressure values; c) transforming the time dependent vapor pressure values, and the consumption rate of butane over the first interval of time, to data output comprising a projected rate of butane consumption. 23. A method for simplifying record keeping requirements for butane use at a petroleum products tank farm comprising: a) drawing a gasoline stream from a tank of gasoline; b) drawing a butane stream from a tank of butane; c) blending the butane stream and the gasoline stream to form a blend; d) monitoring the volatility of the gasoline stream and the butane stream; e) monitoring the rate at which the butane stream is blended with the gasoline stream; f) inputting the monitored volatilities and monitored blend rate