Each rice bag is approximately 20” X 4” and is divided into 4 separate (but connected) sections, allowing you to tuck and wrap easily. Note: When heated, the rice pack gives off a delightfully warm ricey scent. The first several times you use it, it will produce some steam as well! Don’t be alarmed. After several uses it will no longer steam when heated. Please be cautious when handling. Depending on your microwave, the bag may heat unevenly, creating hot spots. Make sure you know your microwave. To help prevent uneven heating you can flip or turn the rice pace halfway through heating.