A rice bag is a microwavable bag filled w/rice & when you heat it up in the microwave, you can put it on a sore muscle or joint & it's very soothing. I put a little lavender oil in the rice so it smells heavenly! I found a free pattern online & 1 yard of material makes 4 bags! They make nice gifts for Christmas. I'll post a pic when they're done so you can see.