An energy harvesting device , comprising: an insulated container, comprising: a deformable outer membrane comprising an outer surface and an inner surface, the outer surface being in contact with an external environment ; a deformable inner membrane, spaced apart from the deformable outer membrane, having an outer surface and an inner surface; an outer cavity spaced between the deformable outer membrane and the deformable inner membrane; and an inner cavity encapsulated by the deformable inner membrane; an outer heat exchanger coupled to the deformable outer membrane, comprising an outer surface exposed to the external environment , and an inner surface exposed to the outer cavity ; a thermoelectric generator , positioned within the inner cavity , the thermoelectric generator comprising an outer surface exposed to the outer cavity through the deformable inner membrane, and an inner surface, thermally-coupled to an inner heat exchanger ; and a phase-change material membrane, at least a portion of the phase-change material membrane coupled to the inner heat exchanger , and encapsulating a mass of phase-change material , wherein the insulated container is configured to be deformed between an expanded configuration and a compressed configuration, wherein when in the expanded configuration, the inner surface of the outer heat exchanger is spaced apart from the outer surface of the thermoelectric generator , and wherein when in the compressed configuration, the inner surface of the outer heat exchanger is positioned proximate to the outer surface of the thermoelectric generator . an insulated container, comprising: a deformable outer membrane comprising an outer surface and an inner surface, the outer surface being in contact with an external environment ; a deformable inner membrane, spaced apart from the deformable outer membrane, having an outer surface and an inner surface; an outer cavity spaced between the deformable outer membrane and the deformable inner membrane; and an inner cavity encapsulated by the deformable inner membrane; a deformable outer membrane comprising an outer surface and an inner surface, the outer surface being in contact with an external environment ; a deformable inner membrane, spaced apart from the deformable outer membrane, having an outer surface and an inner surface; an outer cavity spaced between the deformable outer membrane and the deformable inner membrane; and an inner cavity encapsulated by the deformable inner membrane; an outer heat exchanger coupled to the deformable outer membrane, comprising an outer surface exposed to the external environment , and an inner surface exposed to the outer cavity ; a thermoelectric generator , positioned within the inner cavity , the thermoelectric generator comprising an outer surface exposed to the outer cavity through the deformable inner membrane, and an inner surface, thermally-coupled to an inner heat exchanger ; and a phase-change material membrane, at least a portion of the phase-change material membrane coupled to the inner heat exchanger , and encapsulating a mass of phase-change material , wherein the insulated container is configured to be deformed between an expanded configuration and a compressed configuration, wherein when in the expanded configuration, the inner surface of the outer heat exchanger is spaced apart from the outer surface of the thermoelectric generator , and wherein when in the compressed configuration, the inner surface of the outer heat exchanger is positioned proximate to the outer surface of the thermoelectric generator . <EOS>