Novel form stable phase change material (PCM) composites were synthesized by loading OM-11 (melting point 9.41 °C and freezing point −15 °C) in: (i) activated charcoal (PCM-AC composite; 69.24 kJ kg−1), (ii) silica-gel (PCM-SG composite; 52.65 kJ kg−1) and (iii) rice husk as support matrix. Rice husk composite showed poor performance in PCM loading. Energy storage and thermo-physical properties of PCM-AC and PCM-SG composites were analyzed using FTIR, TGA, DSC, DLS and FESEM. PCM-AC composite successfully eliminated supercooling behavior besides accounting energy storage and leak prevention issues. PCM-SG composite could not minimize the supercooling issue like PCM-AC composite could. Therefore, TCP box performance was analyzed with PCM-AC composite. Total 700 g of PCM-AC composite was sealed inside packets of appropriate sizes and placed over expanded polystyrene (EPS) sheet fitted inside a flute B-type corrugated box (L × W × H: 0.265 m × 0.265 m × 0.165 m). The temperature of tomato (inside box) could be maintained lower than 14 °C for: (i) 510min and (ii) 250min respectively once the equilibrated (inside refrigerator at 8 °C) box was placed at two different ambient temperatures of 23 °C and 43 °C. PCM-AC composite with reduced supercooling and high energy storage ability (69.24 kJ kg−1) appeared promising alternative to conventional refrigeration based cooling system. Even this composite is suitable for popularly used TCP boxes for transportation of perishable (heat-sensitive) materials at low temperature (maximum 11 °C).