US Patent 8424335 Cascading series of thermally insulated passive temperature controlled containers

A modular collection of components from which a variety of thermally insulated and thermal controlled containers can be assembled. The collection includes at least two differently sized sleeves of thermal insulation, and at least two differently sized sleeves of phase change material that are nestable with one another to form various thermally insulated and thermally controlled containers with various combinations of available payload, target temperature, guaranteed duration of thermal control, size of container and weight of container.