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A portable soft sided insulated container has an impermeable liner that provides a liquid holding barrier. The liner is folded from a single monolithic plastic sheet to reduce or eliminate the need for heat welded seams. The liner seats within the container and has a releasable attachment around its

A portable soft sided insulated container has an impermeable liner that provides a liquid holding barrier. The liner is folded from a single monolithic plastic sheet to reduce or eliminate the need for heat welded seams. The liner seats within the container and has a releasable attachment around its lip for mating with the rim of the container. The container has an insulated lid so that the entire assembly may be closed. The liner can be removed for cleaning, or replacement if punctured. When not in use the entire assembly can be folded into a collapsed position for storage. The container has two storage chambers that share a common insulated dividing wall.

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A portable soft sided insulated container has an impermeable liner that provides a liquid holding barrier. The liner is folded from a single monolithic plastic sheet to reduce or eliminate the need for heat welded seams. The liner seats within the container and has a releasable attachment around its

A portable soft sided insulated container has an impermeable liner that provides a liquid holding barrier. The liner is folded from a single monolithic plastic sheet to reduce or eliminate the need for heat welded seams. The liner seats within the container and has a releasable attachment around its lip for mating with the rim of the container. The container has an insulated lid so that the entire assembly may be closed. The liner can be removed for cleaning, or replacement if punctured. When not in use the entire assembly can be folded into a collapsed position for storage. The container has two storage chambers that share a common insulated dividing wall. n said significant amount of said liquid form is not converted to a liquid and vapor mixture within said evaporator feed line. 6. The method of claim 1 wherein the diameter and length of said evaporator feed line are such that, when operating at the same cooling load, the mass flow rate of said refrigerant vapor and liquid mixture measured at said evaporator coil inlet is at least 5% greater than the mass flow rate of refrigerant measured at said evaporator coil inlet of said vapor compression refrigeration system when said significant amount of said liquid form is not converted to a liquid and vapor mixture within said evaporator feed line; wherein said mass flow rate of refrigerant is measured by a vapor reading meter. 7. The method of claim 6 wherein the mass flow rate of said refrigerant vapor and liquid mixture measured at said evaporator coil inlet is from approximately 5 to 20% greater than the mass flow rate of refrigerant measured at the evaporator inlet when said significant amount of said liquid form is not converted to a liquid and vapor mixture within said evaporator feed line. 8. The method of claim 6 wherein the mass flow rate of said refrigerant vapor and liquid mixture measured at said evaporator coil inlet is approximately 12% greater than the mass flow rate of the refrigerant measured at the evaporator inlet of when said significant amount of said liquid form is not converted to a liquid and vapor mixture within said evaporator feed line. 9. The method of claim 1, wherein, when operating at the same cooling load, buildup of frost on said evaporator coil is reduced such that said vapor compression refrigeration system can be operated without requiring a defrosting cycle over an increased number of refrigeration cycles as compared to said vapor compression refrigeration system when said significant amount of said liquid form is not converted to a liquid and vapor mixture within said evaporator feed line. 10. The method of claim 1, wherein said medium is air, said medium is withdrawn from a refrigerated compartment, circulated through the evaporator in heat exchange relation with the evaporator coil, and returned to the refrigerated compartment, and the differential temperature between said coil and said medium adjacent at least a portion of said coil, during at least a portion of a refrigeration cycle, is sufficient to substantially maintain a relative humidity of said medium. 11. The method of claim 10 wherein said air medium is circulated in counter-current relation to the flow of refrigerant vapor and liquid particles in said evaporating coil wherein the temperature of the air being supplied to said evaporator from said refrigerated compartment is equal to or lower than the temperature of the evaporating coil inlet during at least the portion of a refrigeration cycle. 12. The method of claim 1 wherein said mixture of refrigerant vapor and liquid is supplied to the evaporator coil inlet at a linear velocity of at least 400 feet per minute. 13. The method of claim 12 wherein said linear velocity is at least from 400 to 750 feet per minute. 14. A vapor compression refrigeration system comprising: a compressor for increasing the pressure and temperature of a refrigerant vapor, said compressor having an inlet and an outlet; a condenser having an inlet in flow communication with the outlet of said compressor for liquefying pressurized refrigerant vapor received from said compressor; an expansion device having a first inlet which, during a cooling mode of operation of said refrigeration system, is in flow communication with an outlet of said condenser for receiving liquid refrigerant from said condenser and expanding the same to form an expanded refrigerant fluid, wherein said expanded refrigerant fluid is in a liquid form or substantially in said liquid form with a small vapor fraction; an evaporator including an evaporating coil having an inlet and an outlet, said evaporating coil being in heat excha nge relation with an air medium along substantially the entire length of said coil; an evaporator feed line providing flow communication of said expansion device with said evaporating coil inlet; a suction line providing flow communication of said evaporating coil outlet with said compressor inlet; said expansion device and said evaporator feed line, during a cooling mode of operation of said vapor compression refrigeration system, being sized to convert a significant amount of said liquid form to a liquid and vapor mixture within said evaporator feed line and to provide said evaporating coil inlet with a refrigerant liquid and vapor mixture that includes a substantial vapor portion, said evaporating coil being sized to provide refrigerant comprising liquid and vapor at said outlet of said evaporator coil during the portion of each refrigeration cycle when said expansion device is supplying said mixture of said refrigerant vapor and liquid to said evaporating coil inlet. 15. The vapor compression refrigeration system of claim 14 wherein said expansion device is a multi-functional valve which includes a second inlet, said second inlet being in flow communication with the outlet of said compressor when said refrigeration system is in a defrost mode of operation during which the pressurized refrigerant vapor which is discharged from said compressor outlet is supplied to said multi- functional valve, through said evaporator feed line and into the inlet of said evaporator coil. 16. The vapor compression refrigeration system of claim 15 wherein said multi-functional valve includes a second inlet, a first passageway coupled to the first inlet, said first passageway being gated by a first valve, a second passageway coupled to the second inlet, the second passageway being gated by a second valve, and a metering valve positioned in the first passageway which is activated by the sensor in said suction line. 17. The vapor compression refrigeration system of claim 16 wherein each of said first and second valves is a solenoid valve. 18. The vapor compression refrigeration system of claim 14 wherein said sensor is temperature activated. 19. The vapor compression refrigeration system of claim 14, further comprising a unit enclosure and a refrigeration case, wherein the compressor, evaporator and expansion device are located within the unit enclosure and wherein the evaporator is located within the refrigeration case. 20. The vapor compression refrigeration system of claim 14 wherein said expansion device comprises a thermostatic expansion valve. 21. The vapor compression refrigeration system of claim 14 wherein said expansion device comprises an automatic expansion valve. 22. The vapor compression refrigeration system of claim 14 wherein said expansion device comprises a capillary tube. 23. The vapor compression refrigeration system of claim 14 wherein said expansion device is closer to the outlet of said condenser than to the inlet of said evaporating coil. 24. The vapor compression refrigeration system of claim 14 wherein said expansion device is adjacent the outlet of said condenser. 25. A vapor compression refrigeration system comprising: a compressor for increasing the pressure and temperature of a refrigerant vapor, said compressor having an inlet and an outlet; a condenser having an inlet in flow communication with the outlet of said compressor for liquefying pressurized refrigerant vapor received from said compressor; an expansion device which, during a cooling mode of operation of said refrigeration system, is in flow communication with an outlet of said condenser for receiving liquid refrigerant from said condenser and expanding the same, said expansion device including a thermostatic expansion valve having an inlet and an outlet, the outlet of said thermostatic expansion valve being in series flow communication with an inlet to a multifunctional valve which includes an expansion chamber whereby liquid refrigerant supplie