A modular collection of components comprising at least: (a) three differently sized sleeves of thermal insulation (120, 220, 320) including a smaller, a larger and an intermediate sized sleeve, and (b) three differently sized sleeves of phase change material (115, 215, 315) including a smaller, a larger and an intermediate sized sleeve, (c) from which at least the following thermally insulated containers can be assembled: a smaller payload single insulated container formed by nesting together the smaller sleeve of thermal insulation and the smaller sleeve of a phase change material, an intermediate sized payload single insulated container formed by nesting together the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, a larger payload single insulated container formed by nesting together the larger sleeve of thermal insulation and the larger sleeve of phase change material, and at least one of: a smaller payload double insulated container formed by nesting together the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation and the smaller sleeve of phase change material, an intermediate sized payload double insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, and a smaller payload triple insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation, and the smaller sleeve of phase change material. (a) three differently sized sleeves of thermal insulation (120, 220, 320) including a smaller, a larger and an intermediate sized sleeve, and (b) three differently sized sleeves of phase change material (115, 215, 315) including a smaller, a larger and an intermediate sized sleeve, (c) from which at least the following thermally insulated containers can be assembled: a smaller payload single insulated container formed by nesting together the smaller sleeve of thermal insulation and the smaller sleeve of a phase change material, an intermediate sized payload single insulated container formed by nesting together the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, a larger payload single insulated container formed by nesting together the larger sleeve of thermal insulation and the larger sleeve of phase change material, and at least one of: a smaller payload double insulated container formed by nesting together the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation and the smaller sleeve of phase change material, an intermediate sized payload double insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, and a smaller payload triple insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation, and the smaller sleeve of phase change material. a smaller payload single insulated container formed by nesting together the smaller sleeve of thermal insulation and the smaller sleeve of a phase change material, an intermediate sized payload single insulated container formed by nesting together the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, a larger payload single insulated container formed by nesting together the larger sleeve of thermal insulation and the larger sleeve of phase change material, and at least one of: a smaller payload double insulated container formed by nesting together the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation and the smaller sleeve of phase change material, an intermediate sized payload double insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, and a smaller payload triple insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation, and the smaller sleeve of phase change material. a smaller payload double insulated container formed by nesting together the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation and the smaller sleeve of phase change material, an intermediate sized payload double insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation and the intermediate sized sleeve of phase change material, and a smaller payload triple insulated container formed by nesting together the larger sleeve of thermal insulation, the intermediate sized sleeve of thermal insulation, the smaller sleeve of thermal insulation, and the smaller sleeve of phase change material.