This is a Digital version of the HopeSaC thermal cooker pattern. A HopeSaC is a fabric thermal cooker. Like so many other traditional skills, the art of thermal cooking, also known as retained heat cooking, has been virtually lost to our society. For most of my life, I had no idea that such a wonderful device as a thermal cooker existed. After discovering the thermal cooker and researching it, imagine my surprise to learn that thermal cooking is not a new concept. In fact, thermal cooking, or retained heat cooking, has been around for hundreds, if not thousands, of years. As I learned, studied and experimented with thermal cooking, I discovered a wide range of uses for the cookers. I love the get-up-and-go freedom the cooker gives me. I find myself using the thermal cooker just as much for everyday use as I do for special occasions. I love the money saving aspects the thermo cooker offers, from fuel savings to the grocery bill. I designed the HopeSaC thermal cooker in response to a need to share thermal cooking on a humanitarian trip to Mexico. There was such a great response I decided to offer the pattern for others who may be interested in making one.