One Medi-Pak Cold/Hot Pack 150 x 300mm. Hot packs are ideal for relaxing tense muscles and relieving discomfort. Our Medi-Paks have various applications, including pain relief during labour. Depending on your needs, they can function as a heat therapy or cold pack. They are malleable and anatomically shaped for comfort. These packs will contour to larger muscle areas requiring attention, providing the user with versatility.