One Medi-Pak Cold/Hot Pack 150 x 300mm. Hot packs are ideal to relax tense muscles, relieve discomfort and can also be used to provide relief from pain in labour. Our Medi-Paks can be used for both heat therapy and as a cold pack. They are malleable and anatomically shaped for comfort. These packs will contour to the larger muscle areas that require attention, providing the user positioning versatility.