This study is being done to compare two different Temporary Abdominal Closure methods that could be used in cases of open abdomen. The methods being compared are the Barker's vacuum packing technique (BVPT) and the Open Abdomen Negative Pressure Therapy System (ABThera). The BVPT will be made up by an internal plastic layer to cover abdominal viscera, a second layer with surgical sponges and a suction drain and will be covered by an adhesive plastic layer. Then the dressing will be connected to the hospital's vacuum system. The ABThera dressing is available commercially.