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A container comprises a first container portion and a second container portion joined to the first container portion to define a sealed cavity therebetween. A coolant is disposed within the sealed cavity. The container further comprises a pressure relief apparatus operable to limit pressure in the s

A container comprises a first container portion and a second container portion joined to the first container portion to define a sealed cavity therebetween. A coolant is disposed within the sealed cavity. The container further comprises a pressure relief apparatus operable to limit pressure in the sealed cavity.

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1. A container, comprising:a first container portion joined to a second container portion to define a cavity therebetween; a coolant disposed within the cavity; an opening defined by the second container portion; and a projection carried by the first container portion and disposed within the opening

1. A container, comprising:a first container portion joined to a second container portion to define a cavity therebetween; a coolant disposed within the cavity; an opening defined by the second container portion; and a projection carried by the first container portion and disposed within the opening such that the cavity is sealed; wherein a pressure increase within the cavity moves the container portions apart thereby withdrawing the projection from the opening to unseal the cavity and vent the pressure increase. 2. The container of claim 1, wherein the pressure relief apparatus comprises a joined section that joins the first and second container portions and movement of the first container portion relative to the second container portion ruptures the joined section.3. A container, comprising:a first container portion; a second container portion joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings wherein one of the container portions is movable relative to the other of the container portions in response to the pressure increase to create a passage to vent the pressure increase; wherein the pressure relief apparatus comprises a joined section that joins the first and second container portions and movement of the first container portion relative to the second container portion ruptures the joined section and creates the passage; wherein the joined section includes a first connection region that ruptures at a first pressure and a second connection region that ruptures at a second pressure greater than the first pressure. 4. The container of claim 2, wherein the joined section ruptures in response to an elevated temperature in the sealed cavity to limit pressure in the cavity.5. A container, comprising:a first container portion; a second container portion joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings wherein one of the container portions is movable relative to the other of the container portions in response to the pressure increase to create a passage to vent the pressure increase; wherein the pressure relief apparatus comprises a joined section that joins the first and second container portions and movement of the first container portion relative to the second container portion ruptures the joined section and creates the passage; wherein the joined section ruptures in response to an elevated temperature in the sealed cavity to limit pressure in the cavity; wherein the elevated temperature comprises a first elevated temperature and wherein the joined section includes a first connection region that ruptures at the first elevated temperature and the joined section further includes a second connection region that is rupturable at a second elevated temperature greater than the first elevated temperature. 6. The container of claim 1, wherein the coolant comprises a cross-linked gel.7. The container of claim 6, wherein the gel includes carboxymethylcellulose.8. The container of claim 7, wherein the gel includes a preservative.9. The container of claim 1, wherein the container is exposed to room temperature and wherein the container is capable of maintaining items placed therein within a range of temperatures below room temperature for a period of time.10. The container of claim 9, wherein the range of temperatures is about 10° C. to about 5.50° C. and wherein the period of time is about 4 to about 6 hours.11. A container, comprising:a first container portion defining an interior space for placement of product therein; a second container portion permanently joined to the first container portion at rims of the container portions to define a sealed cavity extending from the rims toward a base of the container; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings comprising a joined section spaced from the rims of the container portions that joins the first and second container portions and wherein the joined section ruptures in response to the pressure increase in the sealed cavity to limit pressure in the cavity. 12. A container, comprising:a first container portion; a second container portion joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings comprising a joined section that joins the first and second container portions and wherein the joined section ruptures in response to the pressure increase in the sealed cavity to limit pressure in the cavity; wherein the joined section includes a first connection region that ruptures at a first pressure and a second connection region that ruptures at a second pressure greater than the first pressure. 13. A container, comprising:a first container portion; a second container portion permanently joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings comprising a joined section that joins the first and second container portions and wherein the joined section ruptures in response to the pressure increase in the sealed cavity to limit pressure in the cavity; wherein the joined section ruptures in response to an elevated temperature in the sealed cavity to limit pressure in the cavity. 14. A container, comprising:a first container portion; a second container portion joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings comprising a joined section that joins the first and second container portions and wherein the joined section ruptures in response to the pressure increase in the sealed cavity to limit pressure in the cavity; wherein the joined section ruptures in response to an elevated temperature in the sealed cavity to limit pressure in the cavity; wherein the elevated temperature comprises a first elevated temperature and wherein the joined section includes a first connection region that ruptures at the first elevated temperature and the joined section further includes a second connection region that ruptures at a second elevated temperature greater than the first elevated temperature. 15. A container, comprising:a first container portion; a second container portion permanently joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings comprising a joined section that joins the first and second container portions and wherein the joined section ruptures in response to the pressure increase in the sealed cavity to limit pressure in the cavity; wherein the coolant comprises a cross-linked gel. 16. The container of claim 15, wherein the gel includes carboxymethylcellulose.17. The container of claim 15, wherein the gel includes a preservative.18. A container, comprising:a first container portion; a second container portion permanently joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings comprising a joined section that joins the first and second container portions and wherein the joined section ruptures in response to the pressure increase in the sealed cavity to limit pressure in the cavity; wherein the container is exposed to room temperature and wherein the container is capable of maintaining items placed therein within a range of temperatures below room temperature for a period of time. 19. The container of claim 18, wherein the range of temperatures is about 10° C. to about 15.5° C. and wherein the period of time is about 4 to about 6 hours.20. A container, comprising:a first container portion; a second container portion joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and a joined section that joins the first and second container portions wherein the joined section ruptures in response to an elevated pressure in the sealed cavity to limit pressure in the cavity, the joined section including a first connection region that ruptures at a first pressure and a second connection region that is rupturable at a second pressure greater than the first pressure. 21. The container of claim 20, wherein the joined section ruptures in response to an elevated temperature to limit pressure within the cavity.22. The container of claim 21, wherein the rupture results from mechanical stress caused by the elevated temperature.23. The container of claim 22, wherein the mechanical stress includes cracking of the joined section.24. The container of claim 21, wherein rupture results from melting of the joined section caused by the elevated temperature.25. The container of claim 20, wherein the coolant comprises a cross-linked gel.26. The container of claim 25, wherein the gel includes carboxymethylcellulose.27. A container, comprising:an inner container portion; an outer container portion permanently joined to the inner container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; wherein the coolant comprises a cross-linked gel, and pressure relief apparatus operable to vent a pressure increase in the sealed cavity to ambient surroundings wherein the pressure relief apparatus comprises only an unobstructed opening in the outer container portion. 28. The container of claim 27, wherein the gel includes carboxymethylcellulose.29. A container, comprising:a first container portion; a second container portion joined to the first container portion to define a sealed cavity therebetween; a coolant disposed within the cavity; and a joined section that joins the first and second container portions wherein the joined section is operable to limit pressure within the cavity; the first container portion further comprising a first wall having a base portion and a first rim and wherein the second container portion comprises a second wall having a second rim and wherein the second rim is joined to the first rim; and the second wall further comprising a first raised portion joined to the base portion that is rupturable in response to a first elevated pressure and a second raised portion joined to the base portion that is rupturable at a second elevated pressure greater than the first elevated pressure. 30. The container of claim 29, wherein the coolant comprises a carboxymethylcellulose cross-linked gel.31. A container, comprising:a first container portion having a first wall, a base portion and a first rim; a second container portion having a second wall and a second rim wherein the second rim is joined to the first rim, thereby defining a cavity between the container portions; a coolant disposed within the cavity; a first raised portion integral with the second wall wherein the first raised portion joins the second wall to the base portion and is rupturable in response to a first elevated pressure; and a second raised portion integral with the second wall wherein the second raised portion joins the second wall to the base portion and is rupturable at a second elevated pressure greater than the first elevated pressure. 32. The container of claim 31, wherein the coolant comprises a carboxymethylcellulose cross-linked gel.