If the temperature-sensitive product must be maintained within 2° – 8° C, the Phase 5 TCP is filled with a material that undergoes phase change at 5°C. This is exactly in the middle of the desired range. Because it can hold 5°C longer than a conventional phase change material (which undergoes phase change at 0° C, and has very little heat capacity at 5°C), significantly less material is required. In addition, the phase change material can be placed in direct contact with the temperature sensitive product because there is no risk of freezing. This reduces the size of the final package because no dunnage or air gaps are required.