These beautiful bags are designed to be used on your sore back, flat, with baffles so that the corn stays where you want it. They are packed with more corn also so that they will stay hot longer. Size is 9" X 9" for the back bag and 5" X 20" for the neck bag and custom sizes can also be requested. I don't have a sore back so I use one of these when I'm sitting in front of the computer to rest my feet on.(The floor is cold) Awesome. My handmade corn bags are made with beautiful flannel fabric and filled with whole field corn. Corn bags are microwavable and consumer friendly. Corn is used because it is a larger grain and holds it’s heat longer. The first several uses will release a small amount of moisture as it comes out of the corn. This is normal and will disappear with use. Corn bags are the all-natural way to relieve aches and pains. I not only make them to sell, I am a dedicated user myself. I use them for back and neck aches when I need to but mostly I use them to keep my feet and other body parts warm. I warm one to take with me in the car; I use one when sitting at my desk to keep my feet warm. I put several in my bed at night to snuggle my toes into. What can I say? I’m hooked on my corn bags. Can be used for backaches, neck pain, migraines, bursitis, arthritis, insomnia, earaches, carpal tunnel syndrome, Fibromyalgia, muscle pain, headaches, sport injuries, and menstrual cramps. There are many colors and patterns to choose from. Please mention which you prefer when ordering. Select from all that are on my site.