I'm assuming you wish to transport it to someone special. Freeze the Heart as cold as you can, turn the freezer to coldest setting.You could, when ready to move it,surround it with freezerblocks (the blue things you can get for picnics etc) and wrap the lot in a couple of dry towels to insulate it from heat. Keep it out of the Sun and away from heat as long as possible. Hope it's appreciated by the reciever :o)