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A vehicle seat includes a seatback having a coverstock defining a seat surface with a flexible lower region and a flexible upper region. The seatback further has a compressible upper bladder beneath the coverstock upper region and a compressible inflation bladder positioned beneath the coverstock lo

A vehicle seat includes a seatback having a coverstock defining a seat surface with a flexible lower region and a flexible upper region. The seatback further has a compressible upper bladder beneath the coverstock upper region and a compressible inflation bladder positioned beneath the coverstock lower region and in fluidic communication with the upper bladder. A first fixed quantity of a flowable medium is contained in and is partially transferrable between the upper bladder and the inflation bladder.

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1. A vehicle seat, comprising: a seatback including: a coverstock defining a seat surface with a flexible upper region, moveable between a compressed position and an extended position, and contacting an upper edge of the seatback and a flexible lower region spaced from the upper edge by the upper re

1. A vehicle seat, comprising: a seatback including: a coverstock defining a seat surface with a flexible upper region, moveable between a compressed position and an extended position, and contacting an upper edge of the seatback and a flexible lower region spaced from the upper edge by the upper region;a compressible upper bladder beneath the coverstock upper region and compressible to permit movement of the upper region into the compressed position;a first compressible inflation bladder positioned beneath the coverstock lower region and in fluidic communication with the upper bladder; anda first fixed quantity of a flowable medium contained in and partially transferrable between the upper bladder and the inflation bladder. 2. The vehicle seat of claim 1, wherein the upper bladder is compressible by transfer of at least a portion of the first fixed quantity of the flowable medium from the upper bladder to the first inflation bladder. 3. The vehicle seat of claim 1, wherein the upper bladder is inflatable by transfer of at least a portion of the first fixed quantity of the flowable medium from the first inflation bladder to the upper bladder to provide a retention force to the upper region in the extended position. 4. The vehicle seat of claim 1, further including a cushion with which the seatback is rotatably coupled, wherein: the seatback is rotatable between an open position and a closed position, the upper region of the seatback being positioned away from the cushion when the seatback is in the open position, and the upper region being in contact with a portion of the cushion when the seatback is in the closed position; andwhen in the closed position, the contact between the upper region with the portion of the cushion compresses the upper bladder, thereby transferring portions of the first fixed quantity of the flowable medium from the upper bladder to the first inflation bladder. 5. The vehicle seat of claim 4, wherein the cushion defines a flexible central region and a flexible edge region, the cushion including: a compressible edge bladder within the edge region and a compressible second inflation bladder within the central region and in fluidic communication with the edge bladder; anda second fixed quantity of the flowable medium contained in and partially transferrable between the edge bladder and the second inflation bladder. 6. The vehicle seat of claim 5, wherein the edge bladder is inflatable by transfer of at least a portion of the second fixed quantity of the flowable medium from the second inflation bladder to the edge bladder to provide a retention force on the edge region of the cushion in an elevated position. 7. A seatback for a vehicle seat, comprising: a coverstock defining a seatback surface with a flexible upper region, moveable between a compressed position and an extended position, and contacting an upper edge of the seatback and a flexible lower region spaced from the upper edge by the upper region;a compressible upper bladder beneath the coverstock upper region and compressible to permit movement of the upper region into the compressed position;a compressible inflation bladder underlying the coverstock lower region and in fluidic communication with the upper bladder; anda fixed quantity of a flowable medium contained in and partially transferrable between the upper bladder and the inflation bladder. 8. The seatback of claim 7, wherein: the inflation bladder is compressible from a neutral state to a compressed state; andwhen the inflation bladder is in the neutral state, the coverstock upper region is compressible from the extended position to the compressed position by corresponding compression of the upper bladder causing at least partial transfer of the fixed quantity of flowable medium from the upper bladder to the inflation bladder. 9. The seatback of claim 8, wherein when the inflation bladder is in the compressed state, at least a portion of the fixed quantity of flowable medium flows from the inflation bladder to the upper bladder, thereby providing a supporting force within the upper bladder to maintain the upper region of the coverstock in the extended position. 10. The seatback of claim 8, wherein: the coverstock defines a neutral shape within the central region; andwhen in the neutral state, the inflation bladder exerts a force on the coverstock lower region to maintain the coverstock lower region in the neutral shape. 11. The seatback of claim 10, wherein when the coverstock lower region is in the neutral shape, the inflation bladder is in the compressed state. 12. The seatback of claim 7, wherein the inflation bladder and the upper bladder are fluidically coupled by a tube in fluidic communication with the upper bladder at a first end thereof and the inflation bladder at a second end thereof. 13. The seatback of claim 7, wherein the inflation bladder and the upper bladder are defined in a single bladder unit, at least one seam thereof separating the inflation bladder and the upper bladder, and a gap in the seam providing fluidic communication between the inflation bladder and the upper bladder. 14. A vehicle seat, comprising: a seatback defining an upper edge and including an upper bladder within an upper region, moveable between a compressed position and an extended position, and contacting the upper edge thereof and a first inflation bladder within the seatback in a lower region spaced from the upper edge by the upper region and compressible to permit movement of the upper region into the compressed position; anda cushion with which the seatback is rotatably coupled;wherein the first inflation bladder is in communication with the upper bladder and defines a first closed unit therewith containing a first fixed quantity of a flowable medium. 15. The vehicle seat of claim 14, wherein the first fixed quantity of the flowable medium is partially transferrable between the first inflation bladder and the upper bladder. 16. The vehicle seat of claim 14, wherein: the first inflation bladder is compressible from a neutral state to a compressed state; andwhen the first inflation bladder is in the neutral state, the upper region of the seatback is compressible from an extended position to a compressed position by compression of the upper bladder causing at least partial transfer of the first fixed quantity of the flowable medium from the upper bladder to the first inflation bladder. 17. The vehicle seat of claim 14, wherein the cushion defines a flexible central region and a flexible edge region and includes: a compressible edge bladder within the edge region and a second compressible inflation bladder within the central region and in fluidic communication with the edge bladder; anda second fixed quantity of the flowable medium contained in and partially transferrable between the edge bladder and the second inflation bladder. 18. The vehicle seat of claim 17, wherein the edge bladder is inflatable by transfer of at least a portion of the second fixed quantity of the flowable medium from the second inflation bladder to the edge bladder to provide a retention force on the edge region of the cushion in an elevated position. 19. The vehicle seat of claim 14, wherein: the seatback is moveable by the rotatable coupling thereof with the cushion between an open position and a folded position, the upper region of the seatback being positioned away from the cushion when the seatback is in the open position, and the upper region being in contact with a portion of the cushion when the seatback is in the folded position; andwhen in the folded position, the contact between the upper region and the cushion compresses the upper bladder, thereby transferring a portion of the first fixed quantity of the flowable medium from the upper bladder to the first inflation bladder.