Our square bags measure about 9 1/2" x 9 1/2". They work great for warming or cooling body parts. Place them on your back as you lean back in your chair. This will help with the lower back pains. Heat them up and place them in your bed moments before you jump in...you'll love your side of the heated bed!! Warming pillow works great for those cold drives to work, or just warm it up and sit with it while at work.