This article reviews the types of containment used on bulk storage in tank heat exchangers, macro encapsulation and micro encapsulation. The various schematics of containment used in latent heat thermal energy storage (LHTS) systems are summarized. The pressure drop due to encapsulation was reviewed and the effective ways of thermal conductivity enhancement techniques are discussed. Various containment methods like Shell type, hollow spheres, packed bed, micro encapsulation along with various experiments and investigations were categorized and listed. Around 50 related articles were reviewed on PCM innovation for further studies in this area.