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.