Every winter I make bags and fill with rice sometimes add a removable pillowcase to cover it. Pop in the microwave for a few minutes and you have a nice warm heatie, as I call them. I use when I'm not feeling well or when I'm cold. I have about 7. And I made some smaller ones for my head and eyes that I keep in the freezer, they are wonderful when I have migraines, and I have about 7 of those too...