A vessel (10) or heat exchanger (142) includes an exterior container (12, 112), an interior container (20, 120), and a support structure in the form of a lattice structure (26, 126). The exterior container (12, 112) is formed by an exterior wall (14, 114) that prevents transmission of a fluid. The interior container (20, 120) is formed by an interior wall (22, 122) disposed within the exterior container (12, 112) such that the exterior container (12, 112) encapsulates the interior container (20, 120). The interior wall (22, 122) and the exterior wall (14, 114) are separated by a gap (24, 124) defining a barrier void. The interior wall (22, 122) prevents transmission of a fluid across the interior wall (22, 122). The support structure (26, 126) is disposed within the barrier void between the exterior wall (14, 114) and the interior wall (22, 122). The support structure (26, 126) comprises a lattice and is integrally formed with the exterior wall (14, 114) and the interior wall (22, 122). The support (26, 126) structure is connected to and extends between the exterior wall (14, 114) and the interior wall (22, 122).
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