The potato bags I have made measure about 12 inches by 22 inches. They have a 2 inch flap at the top rather like an envelope. I use scrap fabrics-usually 2 different coordinating fabrics and scrap cotton batting. I understand that cotton is preferable as polester could get hot enough from the cooking potato the the poly could melt and cause combustion. I sell mine for $5 at our Guild's quilt show and bazaar. I have seen them marked at gift shops for $15.00. They sell like hotcakes.